body { font-family: Arial; background: #f4f4f4; }
.box { background: white; padding: 20px; margin: 20px; width: 300px; }
input, button { width: 100%; padding: 8px; margin: 5px 0; }
button { background: #333; color: white; border: none; }
a { color: red; }
.error { color: red; }