* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    flex-direction: column;
    justify-content: center;
    align-items: center ;

    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

body img {
    max-width: 80%;
}


ul {
    position: relative;
    display: flex;
}

ul li {
    position: relative;
    list-style: none;
}

ul li a {
    position: relative;
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #fff;
    margin: 0 10px;
    text-decoration: none;
    font-size: 30px;
    border-radius: 50%;
    color: #e2e2e2;
    box-shadow: inset -1px -1px 2px rgba(0,0,0,0.2),
                2px 2px 5px rgba(0,0,0,0.2);
    transition: 0.5s;
}

ul li a:hover {
    color: #999;
    transform: translateY(-20px);
    box-shadow: inset -1px -1px 2px rgba(0,0,0,0.2),
                2px 24px 10px rgba(0,0,0,0.2);
}

ul li a .fa {
    color: #fff;
    position: relative;
    z-index: 1;
}

ul li a:before {
    content: '';
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    border-radius: 50%;
    border: 2px solid rgba(0,0,0,0.1);
}

ul li:nth-child(1) a:before {
    background-color: #1877f2;
}

ul li:nth-child(2) a:before {
    background-color: #f60000;
}