#btn-return-top {
    position: fixed;
    z-index: 100;
    right: -60px;
    bottom: 50px;
    height: 49px;
    width: 52px;
    opacity: 0;
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    border-radius: 3px;
    background-color: rgba(0, 0, 0, 0.2);
    padding: 10px 9px 15px 9px;
    -webkit-transition: all 0.2s ease-in-out;
    -moz-transition: all 0.2s ease-in-out;
    -ms-transition: all 0.2s ease-in-out;
    -o-transition: all 0.2s ease-in-out;
    transition: all 0.2s ease-in-out;
}

#btn-return-top.show {
    opacity: 1;
    right: 20px;
}

#btn-return-top:hover {
    background-color: rgba(0, 0, 0, 0.4);
}

#btn-return-top-arrow {
    margin: 0 6.5px;
}

#btn-return-top-arrow path {
    fill: #fff;
}