style.css

body {
    background-image: linear-gradient(to bottom right, #4b6cb7, #182848);
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    width: auto;
    height: auto;
  }

  .container {
    padding: 200px;
    padding-left: 0;
    padding-right: 0;
    width: 100%;
    height: 100%;
    justify-content: center;
    align-items: center;
  }
  
  .center {
    width: 500px;
    height: 500px;
    margin: 0 auto;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    border: 2px solid #ddd;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }
  
  h1 {
    margin-top: 0;
  }
  
  form {
    margin-top: 20px;
  }
  
  input[type="number"] {
    width: 60px;
  }
  
  input[type="button"] {
    margin-top: 10px;
    padding: 10px;
    font-size: 16px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  input[type="button"]:hover {
    background-color: #3e8e41;
  }
  
  #total-time {
    margin-top: 20px;
    font-size: 20px;
    font-weight: bold;
  }
  
  @media (max-width: 768px) {
    .container {
      width: 100%;
      height: auto;
      border: none;
      box-shadow: none;
      border-radius: 0;
      padding-top: 250px;
      display: flex;
      justify-content: center;
      align-items: center;
      flex-direction: column;
    }
    
    .center {
        width: 90%;
        height: 50%;
    }
  }