* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
  }
  
  body {
    background: linear-gradient(to right, #f9f9f9, #e0f7fa);
    display: flex;
    justify-content: center;
    padding: 30px;
    min-height: 100vh;
  }
  
  .container {
    width: 100%;
    max-width: 800px;
    text-align: center;
  }
  
  h1 {
    margin-bottom: 20px;
  }
  
  .input-group {
    margin-bottom: 20px;
  }
  
  input[type="datetime-local"] {
    padding: 10px;
    margin: 10px;
    width: 250px;
  }
  
  button {
    padding: 10px 20px;
    background-color: #0288d1;
    border: none;
    color: white;
    border-radius: 5px;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #01579b;
  }
  
  .timers-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
  }
  
  .timer-box {
    background-color: white;
    border: 2px solid #ccc;
    padding: 20px;
    width: 200px;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    animation: fadeIn 0.5s ease-in;
  }
  
  .timer-box h3 {
    font-size: 1rem;
    margin-bottom: 10px;
  }
  
  .time-values {
    display: flex;
    flex-direction: column;
    gap: 5px;
    font-size: 1.2em;
    animation: tick 1s infinite;
  }
  
  .time-values span {
    font-weight: bold;
  }
  
  @keyframes fadeIn {
    from {opacity: 0;}
    to {opacity: 1;}
  }
  
  @keyframes flash {
    0% { background-color: #ffeb3b; }
    100% { background-color: white; }
  }
  
  @keyframes tick {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
  }