* css meaning

.parent {
    background: red;
}
.child {
    overflow: hidden;
    height: 0;
    background: blue;
    -webkit-transition: all .8s ease;
    -moz-transition: all .8s ease;
    -ms-transition: all .8s ease;
    -o-transition: all .8s ease;
    transition: all .8s ease;
    color: white;
}
.parent:hover > .child {
    height: 30px;
    display: block;
}

Source: stackoverflow.com

* css meaning

cascade style sheet

Similar codes

23 votes281 views5 answers
Center div using flex
CSS
8 votes265 views5 answers
Css multicolor background
CSS
0 vote269 views1 answer
How to hide text that is longer than its parent div
CSS
20 votes259 views5 answers
Css coor background
CSS
4 votes270 views4 answers
Ngclass multiple conditions
CSS
8 votes230 views5 answers
Css triangle
CSS
0 vote263 views1 answer
Calc(100vh - px)
CSS
0 vote298 views2 answers
Position relative and absolute difference in css
CSS
4 votes271 views2 answers
Css zebra
CSS
1 vote258 views1 answer
Fade other items on hover
CSS