.back-to-top {
    background: black none repeat scroll 0 0;
    border-radius: 10%;
    color: #979797;
    position: fixed;
    bottom: 25px;
    right: 25px;
    z-index: 999;
    display: none;
    padding: 8px 0;
    width: 44px;
    height: 44px;
    text-align: center;
    cursor: pointer;
}

.back-to-top:hover {
    background: -webkit-gradient(linear, left top, left bottom, from(#7579FF), to(#B224EF));
    background: linear-gradient(#7579FF, #B224EF);
    -moz-transition: all .5s ease;
    -o-transition: all .5s ease;
    -webkit-transition: all .5s ease;
    transition: all .5s ease;
}

.back-to-top a {
    margin-top: 2px;
    color: #fff !important;
    font-size: 24px;
    font-weight: 700;
}