style.css

{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body
{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: #000;
}
ul
{
    position: relative;
    display: flex;
}
ul li
{
    position: relative;
    list-style: none;
    margin: 0 20px;
    cursor: pointer;
}
ul li a
{
    text-decoration: none;
}
ul li a .fa-brands
{
    font-size: 6em;
    color: #222;
}
ul li a::before
{
    font-family: "FontAwesome";
    position: absolute;
    top: 0;
    left: 0;
    font-size: 6em;
    height: 0;
    overflow: hidden;
    transition: 0.5s ease-in-out;
}
ul li:nth-child(1) a::before
{
    content: "\f26b";
    color: #1EBBEE;
}
ul li:nth-child(2) a::before
{
    content: "\f232";
    color: #25d366;
}
ul li:nth-child(3) a::before
{
    content: "\f16d";
    background-image: linear-gradient(45deg,#f09433 0%,#e6683c 25%,#dc2743 50%,#cc2366 75%,#bc1888 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
ul li:nth-child(4) a::before
{
    content: "\f2ab";
    color: #FFFC00;
}
ul li:nth-child(5) a::before
{
    content: "\f09b";
    color: #fafafa;
}
ul li:nth-child(6) a::before
{
    content: "\f1bc";
    color: #1DB954;
}
ul li:nth-child(7) a::before
{
    content: "\f1cb";
    color: #F0F8FF;
}
ul li:hover a::before
{
    height: 100%;
}