如何将CSS应用于除了悬停的其他元素？

Question

On the web you will see the last time a lot of beautiful hover effects, especially for a portfolio page, where, when you hover over an item, the other once will be get a lower opacity, so the one you hover on is highlighted.

I tried to accomplished this effect and I finished with this (also a more extensive one in CodePen ):

 a { text-decoration: none; transition: color 0.1s linear; -moz-transition: color 0.1s linear; -webkit-transition: color 0.1s linear; -o-transition: color 0.1s linear; } a:link, a:visited { color: inherit; } /* Body color */ a:hover, a:active { color: #d7354a; } h1, h2, h3, h4, h5, h6 { font-weight: normal; /*margin: 16px 0;*/ } h1 { font-family: "Adelle", Arial, sans-serif; font-size: 80px; line-height: 90px; } h3, h4 { color: #000; } h3 { font-size: 28px; /* 28px / 16px = 100% */ font-weight: 600; line-height: 38px; } .txt-center { text-align: center; } body { margin: auto; font-family: "Merriweather", Arial, sans-serif; font-size: 18px; /* 18px = 100% */ line-height: 26px; letter-spacing: 1px; color: #6f6f6f; -webkit-font-smoothing: none; -webkit-font-smoothing: subpixel-antialiased; -webkit-font-smoothing: antialiased; } section { padding: 80px 0; position: relative; } #register div:hover .group { opacity: .5; } #register div .group:hover { opacity: 1; } #register hgroup { margin-bottom: 80px; } #register .group a { display: block; color: #333; } #register .group a:hover .button { background: #FFF; color: #d7354a; -webkit-transition: all 0.2s ease; -moz-transition: all 0.2s ease; -ms-transition: all 0.2s ease; -o-transition: all 0.2s ease; transition: all 0.2s ease; } #register .group figure { margin-bottom: 30px; } #register .group figure img { display: inline-block; vertical-align: middle; -webkit-transform: translateZ(0); -moz-transform: translateZ(0); -o-transform: translateZ(0); transform: translateZ(0); -webkit-backface-visibility: hidden; backface-visibility: hidden; -webkit-transition-duration: 0.3s; -moz-transition-duration: 0.3s; -o-transition-duration: 0.3s; transition-duration: 0.3s; -webkit-transition-property: transform; -moz-transition-property: transform; -o-transition-property: transform; transition-property: transform; -webkit-transition-timing-function: ease-out; -moz-transition-timing-function: ease-out; -o-transition-timing-function: ease-out; transition-timing-function: ease-out; } #register .group:hover figure img { -webkit-transform: translateY(-6px); transform: translateY(-6px); } #register .group p:first-of-type { font-family: "Ubuntu", Arial, sans-serif; font-size: 22px; font-weight: 500; } #register .group h3 { font-size: 70px; line-height: 100px; font-weight: 400; color: inherit; text-transform: lowercase; } 

 <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/> <main class="main"> <section class="page-header" id="register"> <div class="container"> <div class="row"> <hgroup class="col-md-10 col-md-offset-1 txt-center"> <h1> Register </h1> </hgroup><!-- End hgroup.col-md-10 col-md-offset-1 --> <div class="col-md-6 group txt-center"> <a href="#"> <figure> <img src="http://placehold.it/120x120" alt="Register as Watcher"> </figure> <p>Register as</p> <h3>Watcher</h3> <p> Suspendisse sodales ut neque ut facilisis. <br> Cras lobortis vestibulum varius. </p> <div class="button secondary">I am a watcher</div> </a> </div><!-- End div.col-md-6 group txt-center --> <div class="col-md-6 group txt-center"> <a href="#"> <figure> <img src="http://placehold.it/120x120" alt="Register as Vlogger"> </figure> <p>Register as</p> <h3>Vlogger</h3> <p> Suspendisse sodales ut neque ut facilisis. <br> Cras lobortis vestibulum varius. </p> <div class="button secondary">I am a vlogger</div> </a> </div><!-- End div.col-md-6 group txt-center --> </div><!-- End div.row --> </div><!-- End div.container --> </section><!-- End section#hero --> </main> 

But the problem here is, when your cursor is already in a certain area (around the "Register" text), it will give both items a lower opacity. And that's not what I want. What I want is, that when you hover over the div .group it will give the other one a lower opacity.

I know you can reach this with jQuery, but I know also this should be possible with CSS only . How can I achieve what I am looking for?

Answer 1

The solution is actually simple considering how far you'd have actually got to in terms of achieving it.

The following are the fixes that I had done:

• Added another selector which sets opacity of all sibling .group elements to 1 when the mouse is over the hgroup which has the "Register" text.
• Changed the margin-bottom: 80px on the hgroup to padding-bottom: 80px because margin is not a part of the element whereas the area occupied by the padding is. Hence, the hgroup:hover selector would apply even when the mouse is over the space below the "Register" button (but not inside the .group itself).
• Added a margin-left: 0px to the hgroup because the Bootstrap CSS was by default giving the hgroup element a 80px left margin which was causing problems to the hgroup:hover selector.

In the below snippet, I have also added a black border around the hgroup and .group elements for you to see the boundaries.

 a { text-decoration: none; transition: color 0.1s linear; -moz-transition: color 0.1s linear; -webkit-transition: color 0.1s linear; -o-transition: color 0.1s linear; } a:link, a:visited { color: inherit; } /* Body color */ a:hover, a:active { color: #d7354a; } h1, h2, h3, h4, h5, h6 { font-weight: normal; /*margin: 16px 0;*/ } h1 { font-family: "Adelle", Arial, sans-serif; font-size: 80px; line-height: 90px; } h3, h4 { color: #000; } h3 { font-size: 28px; /* 28px / 16px = 100% */ font-weight: 600; line-height: 38px; } .txt-center { text-align: center; } body { margin: auto; font-family: "Merriweather", Arial, sans-serif; font-size: 18px; /* 18px = 100% */ line-height: 26px; letter-spacing: 1px; color: #6f6f6f; -webkit-font-smoothing: none; -webkit-font-smoothing: subpixel-antialiased; -webkit-font-smoothing: antialiased; } section { padding: 80px 0; position: relative; } #register div:hover .group { opacity: .5; } #register hgroup:hover ~ .group { opacity: 1; } #register div .group:hover { opacity: 1; } #register hgroup { padding-bottom: 80px; width: 100%; margin-left: 0; } #register .group a { display: block; color: #333; } #register .group a:hover .button { background: #FFF; color: #d7354a; -webkit-transition: all 0.2s ease; -moz-transition: all 0.2s ease; -ms-transition: all 0.2s ease; -o-transition: all 0.2s ease; transition: all 0.2s ease; } #register .group figure { margin-bottom: 30px; } #register .group figure img { display: inline-block; vertical-align: middle; -webkit-transform: translateZ(0); -moz-transform: translateZ(0); -o-transform: translateZ(0); transform: translateZ(0); -webkit-backface-visibility: hidden; backface-visibility: hidden; -webkit-transition-duration: 0.3s; -moz-transition-duration: 0.3s; -o-transition-duration: 0.3s; transition-duration: 0.3s; -webkit-transition-property: transform; -moz-transition-property: transform; -o-transition-property: transform; transition-property: transform; -webkit-transition-timing-function: ease-out; -moz-transition-timing-function: ease-out; -o-transition-timing-function: ease-out; transition-timing-function: ease-out; } #register .group:hover figure img { -webkit-transform: translateY(-6px); transform: translateY(-6px); } #register .group p:first-of-type { font-family: "Ubuntu", Arial, sans-serif; font-size: 22px; font-weight: 500; } #register .group h3 { font-size: 70px; line-height: 100px; font-weight: 400; color: inherit; text-transform: lowercase; } hgroup, .group{ border: 1px solid; } 

 <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/> <main class="main"> <section class="page-header" id="register"> <div class="container"> <div class="row"> <hgroup class="col-md-10 col-md-offset-1 txt-center"> <h1> Register </h1> </hgroup><!-- End hgroup.col-md-10 col-md-offset-1 --> <div class="col-md-6 group txt-center"> <a href="#"> <figure> <img src="http://placehold.it/120x120" alt="Register as Watcher"> </figure> <p>Register as</p> <h3>Watcher</h3> <p> Suspendisse sodales ut neque ut facilisis. <br> Cras lobortis vestibulum varius. </p> <div class="button secondary">I am a watcher</div> </a> </div><!-- End div.col-md-6 group txt-center --> <div class="col-md-6 group txt-center"> <a href="#"> <figure> <img src="http://placehold.it/120x120" alt="Register as Vlogger"> </figure> <p>Register as</p> <h3>Vlogger</h3> <p> Suspendisse sodales ut neque ut facilisis. <br> Cras lobortis vestibulum varius. </p> <div class="button secondary">I am a vlogger</div> </a> </div><!-- End div.col-md-6 group txt-center --> </div><!-- End div.row --> </div><!-- End div.container --> </section><!-- End section#hero --> </main> 

Answer 2

from your example:

 #register div:hover .group { opacity: .5; }
 #register div .group:hover { opacity: 1; }