body{font-family:sans-serif;background:#eef}
.box{max-width:800px;margin:auto;background:#fff;padding:20px;border-radius:8px}
input,textarea{width:100%;font-size:18px;margin:6px 0;padding:8px}
input[type=submit],button,a{font-size:18px;padding:10px 18px;margin:6px}
.err{color:red}