body{padding:0;margin:0;min-height:100vh;font-family:arial,sans-serif}@media (max-width:400px){body{padding:10px}}.full-height{min-height:100vh}.flex-center{align-items:center;display:flex;justify-content:center}.content{max-width:400px}h2{text-align:center}.code,textarea{font-family:"Courier New","Courier",monospace;width:100%;padding:4px;border:1px #ccc solid;border-radius:4px}