Calculator app

This is a calculator web page with various themes that I made with HTML, CSS, and JavaScript.

General:

I've created output boxes and buttons using HTML flex and grid, which I found to be very useful for layout.

I've used SCSS, a modified form of standard CSS, for styling.

And all of the features are implemented with JavaScript.

Eval(), which accepts a string as input and calculates the expression, is the key function employed.

Themes and output:

Theme 1:

Theme 2:

Theme 3: