#cstt-scroll-top{position:fixed;z-index:9999;width:50px;height:50px;background:#333;color:#fff;border-radius:50%;box-shadow:0 4px 10px rgba(0,0,0,.25);opacity:0;visibility:hidden;transition:all .3s ease;display:flex;align-items:center;justify-content:center;text-decoration:none}#cstt-scroll-top.show{opacity:.85;visibility:visible}#cstt-scroll-top:hover{opacity:1;transform:scale(1.08)}.cstt-left-bottom{bottom:25px;left:25px}.cstt-right-bottom{bottom:25px;right:25px}.cstt-left-top{top:25px;left:25px}.cstt-right-top{top:25px;right:25px}.cstt-center-bottom{bottom:25px;left:50%;transform:translateX(-50%)}.cstt-icon{display:block;width:28px;height:28px;background-size:contain;background-repeat:no-repeat;background-position:center}