.calculator { background-color: #fff; border: 1px solid #ddd; border-radius: 8px; padding: 20px; box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1); } label { font-size: 16px; margin-right: 10px; } input { padding: 10px; margin: 5px 0; width: 90%; border: 1px solid #ddd; border-radius: 4px; font-size: 14px; } #butun { padding: 10px