body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #222;
    color: #eee;
  }
  .container {
    max-width: 600px;
    margin: 2rem auto;
    background-color: #333;
    padding: 1.5rem;
    border-radius: 8px;
  }
  h1 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    text-align: center;
    color: #fff;
    border-bottom: 1px solid #444;
    padding-bottom: 0.5rem;
  }
  textarea {
    width: 100%;
    height: 300px;
    padding: 0.5rem;
    border: 1px solid #555;
    border-radius: 4px;
    resize: vertical;
    background-color: #444;
    color: #eee;
    box-sizing: border-box;
  }
  textarea:focus {
    outline: none;
    border-color: #666;
  }
  input[type=submit] {
    background-color: #666;
    color: #eee;
    border: none;
    padding: 0.6rem 1.2rem;
    font-size: 1rem;
    margin-top: 1rem;
    border-radius: 4px;
    cursor: pointer;
  }
  input[type=submit]:hover {
    background-color: #777;
  }
  pre {
    background: #444;
    color: #eee;
    padding: 1rem;
    border-radius: 4px;
    border: 1px solid #555;
    white-space: pre-wrap;
    word-wrap: break-word;
  }
  #copy-button, a {
    display: inline-block;
    background-color: #666;
    color: #eee;
    border: none;
    padding: 0.6rem 1.2rem;
    font-size: 1rem;
    margin-top: 1rem;
    margin-right: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
  }
  #copy-button:hover, a:hover {
    background-color: #777;
  }
  .footer {
    text-align: center;
    margin-top: 1.5rem;
    color: #999;
  }
  .footer .motto {
    font-size: 1rem;
    margin: 0.5rem 0;
  }
  .footer .copyright {
    font-size: 0.6rem;
    margin: 0.5rem 0;
  }