body{background-color:#347;color:#333;font-family:-system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol;margin:20px auto;max-width:650px}h1{font-size:24px}.box{background-color:#fff;border:5px solid #ccc;padding:20px}@media(max-width:600px){body{margin:10px}.box{padding:10px}}img{max-width:100%;width:auto}.challenge-form{margin-top:20px}.challenge-form altcha-widget{display:block;margin-bottom:15px}.challenge-form button{background-color:#347;border:0;border-radius:4px;color:#fff;cursor:pointer;font-size:16px;padding:10px 18px}.challenge-error{color:#a00;font-weight:600}