Glowing socialmedia icons/style.css
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root{
    --bg: black;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--bg);
    
}

ul{
    position: relative;
    display: flex;
    gap: 5rem;
}

ul li
{
    position: relative;
    list-style: none;
    width: 8rem;
    height: 8rem;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: 0.5s;

}
ul li:hover{
    z-index: 10000;
    transform: scale(0.75);
}
ul li::before
{
    content: '';
    position: absolute;
    inset: 3rem;
    box-shadow: 0 0 0 1rem var(--clr),
    0 0 0 2rem var(--bg),
    0 0 0 2.2rem var(--clr);
    transition: 0.5s;
}
ul li:hover:before{
    inset: 0;
}
ul li::after
{
    content: '';
    position: absolute;
    inset: 0;
    background: var(--bg);
    transform: rotate(45deg);
}
ul li a
{
    position: relative;
    text-decoration: none;
    color: var(--clr);
    z-index: 10;
    font-size: 2em;
    transition: 0.5s;
}

ul li:hover a
{
    font-size: 3em;
    filter: drop-shadow(0 0 2rem var(--clr)) drop-shadow(0 0 4rem var(--clr)) drop-shadow(0 0 6rem var(--clr));
}