body

   nav {
   text-align: center;
   margin-bottom: 0.5rem;
   }

   .form-container {
      text-align: center;
      margin: 2rem auto;
    }

    .form-container label {
      display: block;
      margin: 0.5rem 0 0.25rem;
      font-weight: bold;
    }

    .form-container select,
    .form-container input {
      padding: 0.5rem;
      font-size: 1rem;
      border: 1px solid #aaa;
      border-radius: 6px;
      margin-bottom: 1rem;
    }

    .form-container button {
      border: none;
      padding: 0.75rem 1rem;
      font-size: 1rem;
      border-radius: 8px;
      cursor: pointer;
      background: #ddd;
      transition: background 0.2s;
    }

    .form-container button:hover {
      background: #ccc;
    }

    #result {
      margin-top: 1.5rem;
      font-size: 1.5rem;
      font-weight: bold;
      color: #444;
      text-align: center;
    }

    input[type=number]::-webkit-inner-spin-button,
    input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;

    }