This simple calculator app is built using JavaScript with Object-Oriented Programming (OOP) principles, ensuring clean, modular, and maintainable code. The app provides all basic arithmetic functions and features a slick, modern design created with HTML5 and CSS3. The user interface is intuitive and responsive, offering a seamless experience across different devices.

The combination of OOP structure and elegant front-end design makes this calculator a practical and visually appealing tool, demonstrating the power of well-structured JavaScript code along with modern web development technologies.