body { font-family: sans-serif; background: #f4f7f6; display: flex; justify-content: center; padding-top: 50px; }
.container { background: white; padding: 2rem; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); width: 400px; text-align: center; }
select, button { width: 100%; padding: 10px; margin: 10px 0; border-radius: 4px; border: 1px solid #ddd; }
button { background: #007bff; color: white; border: none; cursor: pointer; font-weight: bold; }
.result-box { margin-top: 20px; padding: 15px; background: #e9ecef; border-left: 5px solid #007bff; text-align: left; min-height: 50px; }