body {
  font-family: Arial, sans-serif;
  background: #f5f7fb;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 700px;
  margin: 0 auto;
}

section {
  background: white;
  padding: 25px;
  border-radius: 16px;
  margin-bottom: 25px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

.timer1,
.timer2 {
  font-size: 42px;
  font-weight: bold;
  margin: 20px 0;
}

.message1 {
  color: crimson;
  font-size: 20px;
  font-weight: bold;
}

.start1,
.start2 {
  padding: 12px 20px;
  border: none;
  border-radius: 10px;
  background: royalblue;
  color: white;
  cursor: pointer;
  font-size: 16px;
}

.box2 {
  width: 60px;
  height: 60px;
  background: orange;
  border-radius: 12px;
  margin-top: 20px;
  transition: transform 0.3s ease, background 0.3s ease;
}

.animate {
  animation: shake 0.5s infinite;
  background: crimson;
}

@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(10px); }
  50% { transform: translateX(-10px); }
  75% { transform: translateX(10px); }
  100% { transform: translateX(0); }
}