#scroll-to-top_9845343345{
 width:100%;
}
.back-to-top {
 position: fixed;
 right: 0px;
 background-color: #eee;
 padding: 0.3em;
 display: none;
 -webkit-border-top-left-radius: 3px;
 -webkit-border-bottom-left-radius: 3px;
 -moz-border-radius-topleft: 3px;
 -moz-border-radius-bottomleft: 3px;
 border-top-left-radius: 3px;
 border-bottom-left-radius: 3px;
 z-index: 9999;
 height:40px;
 width:40px;
}