#back-top a {
    position: fixed;
    bottom: 20px;
    right: 25px;
    /*background-color: rgb(0, 70, 35);*/
    background-color: rgb(112, 134, 183);
    width: 55px;
    height: 55px;
    text-align: center;
    font-size: 25px;
    z-index: 100;
    color: white;
    transition: all .5s ease-in-out;
}

#back-top a:hover{
    /*background-color: rgb(0, 100, 70);*/
    background-color: rgb(120, 150, 230);
}

#back-top i{
    font-size: 35px;
    padding-top: 8px;
}