.topBtn {
     border-radius: 100%;
     bottom: 20px;
     box-shadow: 0 0 15px rgba(0, 0, 0, 0.15);
     color: #999;
     display: inline-block;
     font-size: 22px;
     height: 60px;
     background: #fff;
     opacity: 0;
     padding-top: 20px;
     position: fixed;
     right: 20px;
     text-align: center;
     width: 60px;
     z-index: 99999;
     -webkit-transition: opacity .3s 0s, visibility 0s .3s;
     -moz-transition: opacity .3s 0s, visibility 0s .3s;
     transition: opacity .3s 0s, visibility 0s .3s;
}
 .topBtn.topVisible, .topBtn.topFadeOut, .no-touch .topBtn:hover {
     -webkit-transition: opacity .3s 0s, visibility 0s 0s;
     -moz-transition: opacity .3s 0s, visibility 0s 0s;
     transition: opacity .3s 0s, visibility 0s 0s;
}
 .topBtn.topVisible {
     visibility: visible;
     opacity: 1;
}
/*.topBtn.topFadeOut {
     opacity: .5;
}
*/