ul.social{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: none;
    list-style: none;
    position: fixed;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    z-index:100;
}
ul li{
    margin: 10px 0;
}
ul li a{
    text-decoration: none;
    color: #fff;
    height: 45px;
    line-height: 45px;
    display: flex;
}
ul li a span:nth-child(2){
    background: #1877f2;
    width: 45px;
    height: 100%;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 15px;
    color:white;
}
ul li a span:nth-child(1){
    width: 0;
    height: 100%;
    background: #1877f2;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    padding-left: 0;
    letter-spacing: 2px;
    overflow: hidden;
    margin-right: 2px;
    border-radius: 0 50px 50px 0;
    transition: 0.3s ease;
    color:white;
}
ul li a:hover span:nth-child(1){
    width: 120px;
    padding-left: 20px;
}
ul li:nth-child(2) a span:nth-child(1),
ul li:nth-child(2) a span:nth-child(2){
    background: #e4405f;
}
ul li:nth-child(3) a span:nth-child(1),
ul li:nth-child(3) a span:nth-child(2){
    background: #1da1f2;
}
ul li:nth-child(4) a span:nth-child(1),
ul li:nth-child(4) a span:nth-child(2){
    background: red;
}