body{font-family:Arial,sans-serif;display:flex;justify-content:center;align-items:center;height:100vh;background-color:#f5f5f5;margin:0}h1{font-size:4rem;color:#3f51b5}.timer-container{text-align:center;border:2px solid #3f51b5;padding:20px;border-radius:10px;background-color:#fff;box-shadow:0 4px 20px #0000001a}