body{font-family:sans-serif;padding:20px}.hidden{display:none}.accordion button{cursor:pointer;background-color:red;border:none;padding:10px;width:100%;text-align:left}.accordion div{padding:10px;border:1px solid #ccc;margin-top:5px}.message.is-error{color:red}.input.is-error{border:1px solid red}