#myBtn { display: block; position: fixed; bottom: -10px; right: 10px; z-index: 999; font-size: 18px; border: none; outline: none; background-color: transparent; color: white; cursor: pointer; padding: 15px; border-radius: 4px; } #myBtn:hover { background-color: transparent; } .circle { width: 320px; height: 320px; -moz-border-radius: 50%; -webkit-border-radius: 50%; border-radius: 50%; overflow:hidden; position:relative; }