#back-top a {
    position: fixed;
    bottom: 20px;
    right: 25px;
    /* background-color: rgba(141, 24, 41, .7); */
    background: rgba(21, 102, 132, 0.4);
    width: 50px;
    height: 60px;
    text-align: center;
    font-size: 25px;
    z-index: 100;
    color: white;
    transition: all .5s ease-in-out;
}

#back-top a:hover{
    /* background-color: rgb(141, 24, 41); */
    background: rgba(21, 102, 132, 0.8);

}

#back-top i{
    padding-top: 15px;
}