body { background:#000; color:#fff; font:20px/1.55 sans-serif; margin:2rem; }
h1, h2 { color:#ff0; }
a { color:#7ddcff; }
nav a { margin-right:1rem; }
.test-box { border:2px solid #ff0; padding:1rem; margin-top:1.5rem; }
button, input { font-size:1rem; padding:.5rem; }