Folder Organization: Create a new project folder and include the following files:
- index.html for the HTML structure.
- styles.css for custom styles (optional).
- app.js for JavaScript functionality.

Calculator Layout:
- Create a <div> or similar element to act as the calculator screen/display. This element will show the current input and results.
- Add buttons for:
  - Digits: Numbers 0-9.
  - Operators: Basic arithmetic operations (+, -, *, /).
  - Control Buttons:
    - "Clear" button to reset the screen.
    - "Equals" button (=) to compute and display the result.

Calculator Styling:
- Use CSS or Bootstrap to style the calculator, ensuring that buttons are appropriately sized and arranged in a grid layout to resemble a typical calculator.
- Style the screen area to be large and clear for displaying the current input and result.

Display Update:
- Implement logic to update the calculator display dynamically as buttons are pressed. When a user clicks a digit or operator button, the corresponding character should appear on the screen.
Calculation Handling:
- Implement the logic to store the current input and operator selections.
- When the "Equals" button is pressed, compute the result of the entered arithmetic expression and display it.
Control Functions:
- Clear the screen and reset any stored values when the "Clear" button is pressed.

Chained Calculations: Allow users to perform multiple calculations without resetting (e.g., 2 + 3 - 1).
Decimal Point Support: Add a button for entering decimal points to allow for floating-point arithmetic.
Keyboard Support: Allow users to use their keyboard to interact with the calculator.

DOM Calculator