body {
 font-family: Arial, sans-serif;
 background-color: #f7f7f7;
 text-align: center;
 padding: 40px;
}
.container {
 max-width: 500px;
 margin: auto;
 background: white;
 padding: 30px;
 border-radius: 10px;
 box-shadow: 0 0 10px #ccc;
}
.timer h2 {
 font-size: 48px;
 margin: 20px 0;
}
button {
 margin: 5px;
 padding: 10px 20px;
 font-size: 16px;
}
input[type="text"] {
 padding: 10px;
 width: 60%;
 margin-bottom: 10px;
}