body { font-family: Arial; padding:20px; }
.center { text-align:center; }
.menu-btn, button { display:block; background:#007bff; color:#fff; padding:15px; margin:10px 0; text-decoration:none; border:none; border-radius:8px; }
input, select { width:100%; padding:10px; margin:8px 0; }