body {
        font-family: 'Arial', sans-serif;
        background: #ffdd00;
        color: #333;
        padding: 20px;
        text-align: center;
        margin: 0;
        display: flex;
        justify-content: center;
        align-items: center;
        min-height: 100vh;
      }

      .container {
        width: 90%;
        max-width: 450px;
        background: white;
        padding: 20px;
        border: 6px solid black;
        text-align: center;
        border-radius: 12px;
        display: flex;
        flex-direction: column;
        gap: 15px;
      }

      h1 {
        font-size: 1.8rem;
        background: #9146ff;
        color: white;
        padding: 12px;
        border: 6px solid black;
        display: inline-block;
        border-radius: 10px;
      }

      p {
        font-size: 1rem;
        margin: 5px 0;
      }

      textarea {
        /* width: calc(100% - 20px); */
        max-width: 100%;
        height: 80px;
        padding: 10px;
        border: 6px solid black;
        font-size: 1rem;
        resize: none;
        border-radius: 8px;
        box-sizing: border-box;
      }

      button {
        background: #ff595e;
        color: white;
        border: 6px solid black;
        padding: 12px;
        font-size: 1rem;
        cursor: pointer;
        border-radius: 8px;
      }

      button:disabled {
        background: #ccc;
        cursor: not-allowed;
      }

      #textDisplay {
        font-size: 1.2rem;
        font-weight: bold;
        padding: 12px;
        background: #ffca3a;
        border: 6px solid black;
        display: inline-block;
        border-radius: 8px;
      }

      #history {
        font-size: 0.9rem;
        padding: 10px;
        background: white;
        border: 6px solid black;
        text-align: left;
        border-radius: 8px;
      }

      select {
        padding: 8px;
        font-size: 1rem;
        border: 6px solid black;
        background: white;
        cursor: pointer;
        border-radius: 8px;
      }

      .button-group {
        display: flex;
        justify-content: space-between;
      }

      .button-group button {
        flex: 1;
        margin: 0 5px;
      }

      @media (max-width: 480px) {
        h1 {
          font-size: 1.5rem;
        }

        textarea {
          font-size: 0.9rem;
        }

        button {
          font-size: 0.9rem;
          padding: 10px;
        }
      }