#toTop {
    display: none;
    text-decoration: none;
    position: fixed;
    bottom: 50px;
    right: 50px;
    overflow: hidden;
    width: 51px;
    height: 51px;
    border: none;
    text-indent: 100%;
    background: url(../images/to-top@2x.png) no-repeat;
    background-size: 100% auto;
}

#toTopHover {
    background: url(../images/to-top@2x.png) no-repeat;
    background-size: 100% auto;
    width: 51px;
    height: 51px;
    display: block;
    overflow: hidden;
    float: left;
    opacity: 0;
    -moz-opacity: 0;
    filter: alpha(opacity=0);
}

#toTop:active, #toTop:focus {
    outline: none;
}