body{background:#111;color:#0f0;font-family:monospace;text-align:center}
input,button{padding:10px;font-size:1.2em;border:none;border-radius:4px}
input{width:60%;background:#222;color:#0f0}
button{background:#0f0;color:#000;cursor:pointer}
pre{white-space:pre-wrap;text-align:left;margin:20px auto;width:90%}