*{box-sizing:border-box;margin:0;padding:0}body{color:#222;background:#f5f7fa;padding:40px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}h1{text-align:center;font-family:Arial,Helvetica,sans-serif}#input{background:#fff;border:1.5px solid #ccc;border-radius:8px;outline:none;width:70%;padding:10px 14px;font-size:14px;transition:all .2s}#output{margin-top:50px}hr{margin-top:100px}@media (width<=600px){#input{width:100%}}