body {
  background: #0e0e0e;
  color: #00ffcc;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

#timer {
  font-size: 4rem;
  font-weight: bold;
  letter-spacing: 3px;
}

.sub {
  margin-top: 10px;
  font-size: 1rem;
  opacity: 0.6;
}

.controls {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}

button {
  padding: 8px 16px;
  font-size: 1rem;
  background-color: #00ffcc;
  color: #0e0e0e;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

label {
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

input[type="checkbox"] {
  transform: scale(1.2);
}