body {
  font-family: Arial, sans-serif;
  background: #f2f2f2;
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: white;
  padding: 30px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

input, button {
  padding: 10px;
  margin: 10px;
  font-size: 16px;
}

button {
  background: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.timer {
  display: flex;
  justify-content: space-around;
  margin-top: 20px;
}

.timer div {
  background: #007bff;
  color: white;
  padding: 15px;
  border-radius: 8px;
  width: 70px;
}

.timer span {
  display: block;
  font-size: 24px;
  font-weight: bold;
}

.hidden {
  display: none;
}