.container {
    margin-top: 30px;
  }
  
  h3 {
    color: #a20000;
    font-weight: bold;
  }
  
  label {
    font-weight: bold;
  }
  
  select,
  input[type="text"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ced4da;
    border-radius: 4px;
  }
  
  select:disabled {
    background-color: #f8f9fa;
  }
  
  #totalBox {
    background-color: none;
    padding: 10px;
    border-radius: 4px;
    text-align: center;
    color: black;
    font-size: 18px;
    font-weight: 700;
  }
  
  /* Button Style */
  #submitButton {
    padding: 10px 20px;
    background-color: #a20000;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  #submitButton:hover {
    background-color: #218838;
  }
  
  /* Responsive Styles */
  @media (max-width: 768px) {
    .col-8 {
      width: 100%;
      margin-bottom: 20px;
    }
  
    .col {
      text-align: center;
    }
  }
  
  h2 {
    color: #a20000;
    font-weight: bold;
    text-align: center;
  }
  
  label {
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
  }
  
  input[type="text"],
  input[type="submit"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    box-sizing: border-box;
  }
  
  .ret {
    background-color: #a20000;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  .assign {
    background-color: #28a745;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  .ret:hover {
    background-color: #bd2e2e;
  }
  
  .assign:hover {
    background-color: #218838;
  }
  
  h3 {
    color: #a20000;
    font-weight: bold;
    text-align: center;
  }
  
  p {
    margin-bottom: 10px;
    text-align: center;
  }
  
  .error {
    color: red;
  }
  
  .success {
    color: green;
  }
  
  @media (min-width: 768px) {
    .bd-placeholder-img-lg {
      font-size: 3.5rem;
    }
  }