#scroll-top-button{position:fixed;bottom:40px;right:20px;width:40px;height:40px;background-color:#007bff;color:#fff;border-radius:50%;text-align:center;line-height:40px;cursor:pointer;box-shadow:0 2px 5px rgba(0,0,0,.3);font-size:18px;z-index:1000}#scroll-top-button.hide{display:none}#scroll-top-button.show{display:block}#scroll-top-button:hover{background-color:#0056b3}