body {
  font-family: sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #f0f0f0;
}
.timer-container {
  text-align: center;
  background: white;
  padding: 2rem;
  border-radius: 15px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
h1 {
  font-size: 4rem;
  margin: 0;
  color: #e74c3c;
}
button {
  margin: 5px;
  padding: 10px 20px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  background: #3498db;
  color: white;
}
button:hover {
  opacity: 0.8;
}