popup-overlay{background:#fff;border:3px solid #666;height:50%;left:25%;position:absolute;visibility:hidden;width:50%}.popup-overlay.active{text-align:center;visibility:visible}.popup-content{visibility:hidden}.popup-content.active{visibility:visible}button{background:#fff;border-radius:30px;color:#666;display:inline-block;font-size:1rem;margin:.2rem;vertical-align:middle}button,button:hover{border:1px solid #666}button:hover{background:#666;color:#fff}