.to-top {
    display: inline-block;
    height: 40px;
    width: 40px;
    position: fixed;
    bottom: 20px;
    right: 10px;
    font-family: 'FontAwesome';
    font-size:1.5em;
    line-height:1.5em;
    /* image replacement properties */
    overflow: hidden;
    text-align:center;
    white-space: nowrap;
    background: #fff;
    visibility: hidden;
    opacity: 0;
    cursor: pointer;
    -webkit-transition: opacity .3s 0s, visibility 0s .3s;
    -moz-transition: opacity .3s 0s, visibility 0s .3s;
    transition: opacity .3s 0s, visibility 0s .3s;
}
.to-top.to-top-is-visible, .to-top.to-top-fade-out, .no-touch .to-top:hover { 
    -webkit-transition: opacity .3s 0s, visibility 0s 0s;
    -moz-transition: opacity .3s 0s, visibility 0s 0s;
    transition: opacity .3s 0s, visibility 0s 0s;
}
.to-top:hover {
    background-color: #dbde0b;
}
.to-top.to-top-is-visible {
    /* the button becomes visible */
    visibility: visible;
    opacity: 1;
}
.to-top.to-top-fade-out {
    /* if the user keeps scrolling down, the button is out of focus and becomes less visible */
    opacity: 1;
}
.to-top-touch .to-top:hover {
    background-color: #dbde0b;
    opacity: 1;
}