.message-board{max-width:600px;margin:20px auto}.message{border:1px solid #ccc;padding:10px;margin-bottom:10px}form{max-width:600px;margin:20px auto}input,textarea{width:100%;padding:10px;margin-bottom:10px}button{padding:10px 20px;background-color:#007bff;color:white;border:0;cursor:pointer}