/**************
.UIBackTopTopControl {
    position: fixed;
    bottom: 2em;
    right: 0px;
    text-decoration: none;
    color: #000000;
    font-size: 12px;
    padding: 1em;
    background:url('Images/back_to_top.png') center top no-repeat;
    background-size:contain;
    width:28px;
    height:28px;
}
**************/
.UIBackTopTopControl:hover {
    background-color: rgba(0, 0, 0, 0.9);
}
.UIBackTopTopControl {
    position: fixed;
    bottom: 10px;
    right: 28px;
    background-color: rgba(0, 0, 0, 0.42);
    z-index: 10;
    width: 50px;
    height: 50px;
    border-radius:1000px;
    color:#fff;
    font: normal normal normal 25px/50px FontAwesome;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-align: center;
}
.UIBackTopTopControl:before {
    content: "\f106";
}