body{font-family:Arial,Helvetica,sans-serif;background:#f0f0f0}#info{background:red;display:none;color:#fff;padding:10px}.container{width:100%;max-width:300px;margin:0 auto;text-align:center}.linkBack{text-decoration:none;color:#000;font-size:20px;position:absolute;top:10px;left:10px}.linkBack:hover{color:gray}.reverseTimer{border:2px solid black;padding:20px;border-radius:10px}button{margin:5px;padding:5px 10px;font-size:16px;cursor:pointer}button:hover{background:#000;color:#fff}h1{margin-bottom:0}h2{margin-top:5px;margin-bottom:5px;display:none}#time{font-size:40px;margin:10px 0}@keyframes blink{0%{color:red}50%{color:#000}to{color:red}}.red-blink{animation:blink 1s infinite}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.2);color:red}to{transform:scale(1)}}.pulse{animation:pulse .8s infinite}.disabled{display:none}