body {
   
        background-image: url("bg.png");
        background-repeat: no-repeat;
        background-attachment: fixed; 
        background-size: cover;
        background-position: relative; 
        margin: 0; 
        font-family: 'Times New Roman', Times, serif; 
    font-family: 'Times New Roman', serif, sans-serif;
  }
  
  .container {
    max-width: 600px;
    margin: 0 auto;
    padding: 40px;
  }
  
  h1 {
    text-align: center;
    font-weight: 400;
    margin-bottom: 20px;
  }
  
  #app {
    background-color: #fff;
    border-radius: 5px;
    padding: 20px;
  }
  
  .timer {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 20px;
  }
  
  .form-group {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
  }
  
  input[type="number"] {
    font-size: 1.2rem;
    padding: 10px;
    border: none;
    border-radius: 5px;
    margin-right: 10px;
    width: 200px;
  }
  
  button#start-btn {
    background-color: black;
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out;
  }
  
  button#start-btn:hover {
    background-color: gray;
  }
  
  button#stop-btn {
    background-color: black;
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    margin-left: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out;
  }
  
  button#stop-btn:hover {
    background-color: gray;
  }