.UIBackTopTopControl:hover {
    background-color: #df2e09;
}
.UIBackTopTopControl {
    position: fixed;
    bottom: 10px;
    right: 28px;
    background-color:  #ff00009e;
    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";
}