.captcha {

  }
  
  #captcha {
    font-size: 24px;
    margin-bottom: 20px;
  }
  
  input[type="text"] {
    margin-bottom: 10px;
  }
  
  button {
    border: none;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #0056b3;
  }