CSS 悬停，同方向过渡效果

Question

I am doing some basic CSS fill transitions on hover. I have used this codepen as an example: https://codepen.io/brandon4117/pen/ihIgE . Now on hover the background position raises to fill the div, and on hover off, the background goes back down. I wanted to know how can I modify this pen, to work such as when hover off the transition should go upwards, rather than down.

Most hover transitions: Hover on new fill top->bottom. Hover off new fill removes bottom->top. I would like to do on hover fill top->bottom, on hover off fill removes top->bottom again.

A look at the CSS being used:

div {border-style: solid;
border-color: black;
color: black;
padding: 50px;
background-size: 200% 200%;
background-image: 
linear-gradient(to top, #A72424 50%, transparent 50%);
background-position:0 100%;
-webkit-transition: background-position 300ms, color 300ms ease, border-color 300ms ease;
-moz-transition: background-position 300ms, color 300ms ease, border-color 300ms ease;
-ms-transition: background-position 300ms, color 300ms ease, border-color 300ms ease;
-o-transition: background-position 300ms, color 300ms ease, border-color 300ms ease;
transition: background-position 300ms, color 300ms ease, border-color 300ms ease;

}

div:hover {color: white;
border-color: #A72424;
background-image: 
linear-gradient(to top, #A72424 50%, transparent 50%);
background-position: 0 0%;
-webkit-transition: background-position 300ms, color 300ms ease, border-color 300ms ease;
-moz-transition: background-position 300ms, color 300ms ease, border-color 300ms ease;
-ms-transition: background-position 300ms, color 300ms ease, border-color 300ms ease;
-o-transition: background-position 300ms, color 300ms ease, border-color 300ms ease;
transition: background-position 300ms, color 300ms ease, border-color 300ms ease;
}

a {color: black; text-decoration: none;
transition: all 100ms linear;
-webkit-transition: all 100ms linear;
-moz-transition: all 100ms linear;
-ms-transition: all 100ms linear;
-o-transition: all 100ms linear;}

a:hover {color: white;
transition: all 100ms linear;
-webkit-transition: all 100ms linear;
-moz-transition: all 100ms linear;
-ms-transition: all 100ms linear;
-o-transition: all 100ms linear;
}

a:active {color: white;}

Thanks

Answer 1

i think it's easier to make this effect with a :before or a :after pseudo element instead of using the background if you're not using self closing tags.

div { padding: 50px; border: 2px solid #000; color: #000; position: relative; transition: 0.3s ease; }
div:after { content: ""; height: 0; width: 100%; background-color: #A72424; position: absolute; top: 0; left: 0; transition: 0.3s ease; }
div:hover { color: #fff; border-color: #A72424; }
div:hover:after { height: 100%; }

in case you need to use the linear gradient you just need to change the linear-gradient direction into "to bottom" instead of "to top"

div { background-image: linear-gradient(to bottom, #A72424 50%, transparent 50%); }
div:hover { background-image: linear-gradient(to bottom, #A72424 50%, transparent 50%); }

Answer 2

Ok I got the answer: For top down do this:

.divclass::after {
    position: absolute;
    transition: 0.3s;
    content: '';
    height: 0;
    top: 50%;
    right: 0;
    width: 3px;
    background: #fff;
    bottom: 0;
    top: auto;
    z-index: -1;
    width: 120%;
}



.divclass:hover::after {
    height: 100%;
    top: 0;
}

Thanks for pointing me in the direction of pseudos Frderico