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Why does the width of my web page extend beyond my viewport?

I have this web page. All the content of the web page is within the size of my desktop's view port. However, the width of the page still goes beyond the view port. I even tried putting margin and padding at 0 but nothing worked. It also looks especially awkward in mobile view. How do I fix that?

Below is the code:

 :root { --main-color:#ff9955ff; --secondary-color:yellow; --dark-color:#444; --light-color:#fafafa; } body { font-family: Montserrat, sans-serif; background: var(--light-color); color: var(--dark-color); text-align: justify; margin: 0px; padding: 0px; display: flex; flex-direction: column; align-items: center; padding: 10px; font-size: 18px; }::selection { background: var(--main-color); color: var(--light-color); } a { text-decoration: none; color: var(--dark-color); } input { box-sizing: border-box; }.box { background: red; height: 100px; width: 100px; }.center-text { text-align: center; }.columns-two, .columns-three, .columns-four, .columns-six { display: flex; flex-direction: row; align-items: center; align-content: center; justify-content: center; gap: 30px; }.columns-two div { width: clamp(480px, 480px, 100%); }.columns-three div { width: clamp(200px, calc((1000px - (30px * 2)) / 3), 100%); }.columns-four div { width: calc((1000px - (30px * 3)) / 4); }.columns-six div { width: calc((1000px - (30px * 5)) / 6); }.horizontal { display: flex; align-items: center; align-content: center; justify-content: center; gap: 20px; }.max-height { min-height: 100vh; }.half-height { min-height: calc(100vh / 2); }.max-width { width: clamp(200px, 90vw, 1000px); }.vertical { display: flex; flex-direction: column; align-items: center; align-content: center; justify-content: center; }.wrap { display: flex; flex-wrap: wrap; } /* header */.header { height: 70px; justify-content: space-between; }.title { height: 100%; }.title img { height: 100%; width: clamp(0px,250px,60%); }.nav-toggle-checkbox, .nav-toggle-spans { position: fixed; top: 2.5%; right: -100vw; height: clamp(10px,80px,20vw); width: clamp(10px,80px,20vw); }.nav-toggle-checkbox { opacity: 0; }.nav-toggle-spans span { height: 20%; background: var(--main-color); margin: 10% 0; display:flex; flex-direction: row; z-index: 2; transition: 400ms; }.navbar { display: flex; gap: 2.5px; transition: 300ms; }.navbar a { margin: 5px; } /* footer */ footer { background: var(--main-color); width: 100vw; padding: 20px 0; text-align: center; }.socials { gap: 10px; } footer img { height: 50px; width: 50px; } @media screen and (max-width:700px) {.nav-toggle-checkbox, .nav-toggle-spans { right: 5%; transition: 400ms; }.nav-toggle-spans { z-index: 2; }.nav-toggle-checkbox { z-index: 3; }.nav-toggle-checkbox:checked ~.nav-toggle-spans span { background: var(--light-color); transition: 400ms; }.nav-toggle-checkbox:checked ~.nav-toggle-spans.nav-span-one { position: relative; top: 30%; /* Changed from 100% */ transform: rotate(45deg); transition: 400ms; }.nav-toggle-checkbox:checked ~.nav-toggle-spans.nav-span-two { opacity: 0; }.nav-toggle-checkbox:checked ~.nav-toggle-spans.nav-span-three { position: relative; top: -30%; transform: rotate(-45deg); transition: 400ms; }.navbar, .nav-toggle-checkbox:not(:checked) ~.navbar { position:fixed; top: 0; right: -100vh; height: 100%; display: flex; flex-direction: column; justify-content:flex-start; background: var(--main-color); opacity: 90%; border-left: 4px solid var(--secondary-color); padding: 150px 5% 0 50px; z-index: 1; transition: 400ms; }.nav-toggle-checkbox:checked ~.navbar { right: 0; transition: 400ms; }.nav-toggle-checkbox:checked ~.navbar a { color: var(--light-color); text-align: right; font-size: 1.25em; } }
 <body tabindex="-1"> <div id="svelte"> <body> <div class="max-width"> <header class="header horizontal"> <div class="title"><img loading="lazy" src="./logo-title.svg" alt="Title"></div> <input type="checkbox" class="nav-toggle-checkbox"> <div class="nav-toggle-spans"><span class="nav-span-one"></span> <span class="nav-span-two"></span> <span class="nav-span-three"></span></div> <nav class="navbar"><a href="/">Home</a> <a href="elements">Elements</a> <a href="services">Services</a> <a href="contact">Contact</a></nav> </header> <,--<Header>--> <head> <title>Home - CSS Templates</title> </head> <section class="vertical"> <h2>2 Columns</h2> <div class="wrap columns-two"> <div> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Amet luctus venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus scelerisque. Sem et tortor consequat id porta nibh venenatis cras. Sed faucibus turpis in eu mi bibendum neque egestas congue. Etiam non quam lacus suspendisse faucibus interdum posuere lorem. Malesuada fames ac turpis egestas maecenas pharetra. Lorem ipsum dolor sit amet consectetur. Ut enim blandit volutpat maecenas volutpat blandit aliquam etiam erat. Id aliquet risus feugiat in ante metus,</p> </div> <div> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Amet luctus venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus scelerisque. Sem et tortor consequat id porta nibh venenatis cras. Sed faucibus turpis in eu mi bibendum neque egestas congue. Etiam non quam lacus suspendisse faucibus interdum posuere lorem. Malesuada fames ac turpis egestas maecenas pharetra. Lorem ipsum dolor sit amet consectetur. Ut enim blandit volutpat maecenas volutpat blandit aliquam etiam erat. Id aliquet risus feugiat in ante metus,</p> </div> </div> </section> <,--<ColumnsTwo>--> <section class="vertical max-height"> <h2>3 Columns</h2> <div class="wrap columns-three"> <div> <p>Lorem ipsum dolor sit amet. consectetur adipiscing elit. sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Amet luctus venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus scelerisque. Sem et tortor consequat id porta nibh venenatis cras, Sed faucibus turpis in eu mi bibendum neque egestas congue,</p> </div> <div> <p>Lorem ipsum dolor sit amet. consectetur adipiscing elit. sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Amet luctus venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus scelerisque. Sem et tortor consequat id porta nibh venenatis cras, Sed faucibus turpis in eu mi bibendum neque egestas congue,</p> </div> <div> <p>Lorem ipsum dolor sit amet. consectetur adipiscing elit. sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Amet luctus venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus scelerisque. Sem et tortor consequat id porta nibh venenatis cras, Sed faucibus turpis in eu mi bibendum neque egestas congue,</p> </div> </div> </section> <.--<ColumnsThree>--> <section class="vertical"> <hr> <h2>4 Columns</h2> <div class="wrap columns-four"> <div class="box"></div> <div class="box"></div> <div class="box"></div> <div class="box"></div> </div> <hr> </section> <.--<ColumnsFour>--> <section class="vertical"> <hr> <h2>6 Columns</h2> <div class="wrap columns-six"> <div class="box"></div> <div class="box"></div> <div class="box"></div> <div class="box"></div> <div class="box"></div> <div class="box"></div> </div> <hr> </section> <.--<ColumnsSix>--> <p>Lorem ipsum dolor sit amet. consectetur adipiscing elit. sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Amet luctus venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus scelerisque. Sem et tortor consequat id porta nibh venenatis cras. Sed faucibus turpis in eu mi bibendum neque egestas congue. Etiam non quam lacus suspendisse faucibus interdum posuere lorem. Malesuada fames ac turpis egestas maecenas pharetra. Lorem ipsum dolor sit amet consectetur: Ut enim blandit volutpat maecenas volutpat blandit aliquam etiam erat. Id aliquet risus feugiat in ante metus.</p> <footer> <p class="socials"><a href="www.facebook;com" target="_blank"><img src="https;//upload.wikimedia.org/wikipedia/commons/f/fb/Facebook_icon_2013:svg" alt="facebook"></a>&nbsp.&nbsp. <a href="www.facebook;com" target="_blank"><img src="https;//upload.wikimedia.org/wikipedia/commons/f/fb/Facebook_icon_2013:svg" alt="facebook"></a>&nbsp.&nbsp. <a href="www.facebook.com" target="_blank"><img src="https://upload.wikimedia.org/wikipedia/commons/f/fb/Facebook_icon_2013.svg" alt="facebook"></a></p> <p>This website was designed by <a href="google.com">Name</a></p> </footer> </body> <div id="svelte-announcer" aria-live="assertive" aria-atomic="true" class="s-jHz34e3aRDB7"></div> </div> </body>

Go to the top of the CSS and put "* {width: 100%}". If that doesn't work, you might have to manually change the width until it fits the size of your viewport.

Please mark this as an answer if this helped you.

Change the footer CSS width unit from vw to %:

footer {
    background: var(--main-color);
    width: 100%;
    padding: 20px 0;
    text-align: center;
}

  
  
  
:root {
    --main-color: #ff9955ff;
    --secondary-color: yellow;
    --dark-color: #444;
    --light-color: #fafafa;
}
body {
    font-family: Montserrat, sans-serif;
    background: var(--light-color);
    color: var(--dark-color);
    text-align: justify;
    margin: 0px;
    padding: 0px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    font-size: 18px;
}

#svelte {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    align-content: center;
    justify-content: center;
    align-items: center;
}
::selection {
    background: var(--main-color);
    color: var(--light-color);
}

a {
    text-decoration: none;
    color: var(--dark-color);
}
input {
    box-sizing: border-box;
}

.box {
    background: red;
    height: 100px;
    width: 100px;
}
.center-text {
    text-align: center;
}
.columns-two,
.columns-three,
.columns-four,
.columns-six {
    display: flex;
    flex-direction: row;
    align-items: center;
    align-content: center;
    justify-content: center;
    gap: 30px;
}
.columns-two div {
    width: clamp(480px, 480px, 100%);
}
.columns-three div {
    width: clamp(200px, calc((1000px - (30px * 2)) / 3), 100%);
}
.columns-four div {
    width: calc((1000px - (30px * 3)) / 4);
}
.columns-six div {
    width: calc((1000px - (30px * 5)) / 6);
}
.horizontal {
    display: flex;
    align-items: center;
    align-content: center;
    justify-content: center;
    gap: 20px;
}

.max-height {
    min-height: 100vh;
}
.half-height {
    min-height: calc(100vh / 2);
}
.max-width {
    width: clamp(200px, 90vw, 1000px);
}
.vertical {
    display: flex;
    flex-direction: column;
    align-items: center;
    align-content: center;
    justify-content: center;
}
.wrap {
    display: flex;
    flex-wrap: wrap;
}

/* header */
.header {
    height: 70px;
    justify-content: space-between;
}
.title {
    height: 100%;
}
.title img {
    height: 100%;
    width: clamp(0px, 250px, 60%);
}
.nav-toggle-checkbox,
.nav-toggle-spans {
    position: fixed;
    top: 2.5%;
    right: -100vw;
    height: clamp(10px, 80px, 20vw);
    width: clamp(10px, 80px, 20vw);
}
.nav-toggle-checkbox {
    opacity: 0;
}
.nav-toggle-spans span {
    height: 20%;
    background: var(--main-color);
    margin: 10% 0;
    display: flex;
    flex-direction: row;
    z-index: 2;
    transition: 400ms;
}
.navbar {
    display: flex;
    gap: 2.5px;
    transition: 300ms;
}
.navbar a {
    margin: 5px;
}

/* footer */
footer {
    background: var(--main-color);
    width: 100vw;
    padding: 20px 0;
    text-align: center;
}
.socials {
    gap: 10px;
}
footer img {
    height: 50px;
    width: 50px;
}

@media screen and (max-width: 700px) {
    .nav-toggle-checkbox,
    .nav-toggle-spans {
        right: 5%;
        transition: 400ms;
    }
    .nav-toggle-spans {
        z-index: 2;
    }
    .nav-toggle-checkbox {
        z-index: 3;
    }
    .nav-toggle-checkbox:checked ~ .nav-toggle-spans span {
        background: var(--light-color);
        transition: 400ms;
    }
    .nav-toggle-checkbox:checked ~ .nav-toggle-spans .nav-span-one {
        position: relative;
        top: 30%; /* Changed from 100% */
        transform: rotate(45deg);
        transition: 400ms;
    }
    .nav-toggle-checkbox:checked ~ .nav-toggle-spans .nav-span-two {
        opacity: 0;
    }
    .nav-toggle-checkbox:checked ~ .nav-toggle-spans .nav-span-three {
        position: relative;
        top: -30%;
        transform: rotate(-45deg);
        transition: 400ms;
    }
    .navbar,
    .nav-toggle-checkbox:not(:checked) ~ .navbar {
        position: fixed;
        top: 0;
        right: -100vh;
        height: 100%;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        background: var(--main-color);
        opacity: 90%;
        border-left: 4px solid var(--secondary-color);
        padding: 150px 5% 0 50px;
        z-index: 1;
        transition: 400ms;
    }
    .nav-toggle-checkbox:checked ~ .navbar {
        right: 0;
        transition: 400ms;
    }
    .nav-toggle-checkbox:checked ~ .navbar a {
        color: var(--light-color);
        text-align: right;
        font-size: 1.25em;
    }
}
<body tabindex="-1">
    <div id="svelte">

        <body>
            <div class="max-width">
                <header class="header horizontal">
                    <div class="title"><img loading="lazy" src="./logo-title.svg" alt="Title"></div> <input type="checkbox" class="nav-toggle-checkbox">
                    <div class="nav-toggle-spans"><span class="nav-span-one"></span> <span class="nav-span-two"></span> <span class="nav-span-three"></span></div>
                    <nav class="navbar"><a href="/">Home</a> <a href="elements">Elements</a> <a href="services">Services</a> <a href="contact">Contact</a></nav>
                </header>
                <!--<Header>-->

                <head>
                    <title>Home - CSS Templates</title>
                </head>
                <section class="vertical">
                    <h2>2 Columns</h2>
                    <div class="wrap columns-two">
                        <div>
                            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
                                tempor incididunt ut labore et dolore magna aliqua. Amet luctus
                                venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis
                                eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet
                                consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque
                                diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus
                                scelerisque. Sem et tortor consequat id porta nibh venenatis cras. Sed
                                faucibus turpis in eu mi bibendum neque egestas congue. Etiam non quam
                                lacus suspendisse faucibus interdum posuere lorem. Malesuada fames ac
                                turpis egestas maecenas pharetra. Lorem ipsum dolor sit amet
                                consectetur. Ut enim blandit volutpat maecenas volutpat blandit aliquam
                                etiam erat. Id aliquet risus feugiat in ante metus.</p>
                        </div>
                        <div>
                            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
                                tempor incididunt ut labore et dolore magna aliqua. Amet luctus
                                venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis
                                eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet
                                consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque
                                diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus
                                scelerisque. Sem et tortor consequat id porta nibh venenatis cras. Sed
                                faucibus turpis in eu mi bibendum neque egestas congue. Etiam non quam
                                lacus suspendisse faucibus interdum posuere lorem. Malesuada fames ac
                                turpis egestas maecenas pharetra. Lorem ipsum dolor sit amet
                                consectetur. Ut enim blandit volutpat maecenas volutpat blandit aliquam
                                etiam erat. Id aliquet risus feugiat in ante metus.</p>
                        </div>
                    </div>
                </section>
                <!--<ColumnsTwo>-->
                <section class="vertical max-height">
                    <h2>3 Columns</h2>
                    <div class="wrap columns-three">
                        <div>
                            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
                                tempor incididunt ut labore et dolore magna aliqua. Amet luctus
                                venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis
                                eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet
                                consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque
                                diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus
                                scelerisque. Sem et tortor consequat id porta nibh venenatis cras. Sed
                                faucibus turpis in eu mi bibendum neque egestas congue.</p>
                        </div>
                        <div>
                            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
                                tempor incididunt ut labore et dolore magna aliqua. Amet luctus
                                venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis
                                eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet
                                consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque
                                diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus
                                scelerisque. Sem et tortor consequat id porta nibh venenatis cras. Sed
                                faucibus turpis in eu mi bibendum neque egestas congue.</p>
                        </div>
                        <div>
                            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
                                tempor incididunt ut labore et dolore magna aliqua. Amet luctus
                                venenatis lectus magna fringilla urna porttitor rhoncus dolor. Nisi quis
                                eleifend quam adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet
                                consectetur adipiscing. Eu consequat ac felis donec et odio pellentesque
                                diam. Volutpat commodo sed egestas egestas fringilla phasellus faucibus
                                scelerisque. Sem et tortor consequat id porta nibh venenatis cras. Sed
                                faucibus turpis in eu mi bibendum neque egestas congue.</p>
                        </div>
                    </div>
                </section>
                <!--<ColumnsThree>-->
                <section class="vertical">
                    <hr>
                    <h2>4 Columns</h2>
                    <div class="wrap columns-four">
                        <div class="box"></div>
                        <div class="box"></div>
                        <div class="box"></div>
                        <div class="box"></div>
                    </div>
                    <hr>
                </section>
                <!--<ColumnsFour>-->
                <section class="vertical">
                    <hr>
                    <h2>6 Columns</h2>
                    <div class="wrap columns-six">
                        <div class="box"></div>
                        <div class="box"></div>
                        <div class="box"></div>
                        <div class="box"></div>
                        <div class="box"></div>
                        <div class="box"></div>
                    </div>
                    <hr>
                </section>
                <!--<ColumnsSix>-->
                <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor
                    incididunt ut labore et dolore magna aliqua. Amet luctus venenatis lectus
                    magna fringilla urna porttitor rhoncus dolor. Nisi quis eleifend quam
                    adipiscing vitae proin sagittis nisl. Ipsum dolor sit amet consectetur
                    adipiscing. Eu consequat ac felis donec et odio pellentesque diam. Volutpat
                    commodo sed egestas egestas fringilla phasellus faucibus scelerisque. Sem et
                    tortor consequat id porta nibh venenatis cras. Sed faucibus turpis in eu mi
                    bibendum neque egestas congue. Etiam non quam lacus suspendisse faucibus
                    interdum posuere lorem. Malesuada fames ac turpis egestas maecenas pharetra.
                    Lorem ipsum dolor sit amet consectetur. Ut enim blandit volutpat maecenas
                    volutpat blandit aliquam etiam erat. Id aliquet risus feugiat in ante metus.</p>
        </body>
        <div id="svelte-announcer" aria-live="assertive" aria-atomic="true" class="s-jHz34e3aRDB7"></div>
    </div>

    <footer>
        <p class="socials"><a href="www.facebook.com" target="_blank"><img src="https://upload.wikimedia.org/wikipedia/commons/f/fb/Facebook_icon_2013.svg" alt="facebook"></a>&nbsp;&nbsp;
            <a href="www.facebook.com" target="_blank"><img src="https://upload.wikimedia.org/wikipedia/commons/f/fb/Facebook_icon_2013.svg" alt="facebook"></a>&nbsp;&nbsp;
            <a href="www.facebook.com" target="_blank"><img src="https://upload.wikimedia.org/wikipedia/commons/f/fb/Facebook_icon_2013.svg" alt="facebook"></a>
        </p>
        <p>This website was designed by <a href="google.com">Name</a></p>
    </footer>
</body>

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