body { font-family: Arial, sans-serif; background:#f4f4f9; }
.container { max-width: 700px; margin: 50px auto; background: white; padding: 24px; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.08); }
input { padding:10px; border-radius:6px; border:1px solid #ddd; margin-right:8px;}
button { padding:10px 12px; border-radius:6px; cursor:pointer;}
#result { margin-top:16px; }