How to locate particular HTML element of PWA in source code

Dear All,

I’ve got source code of project with me and would like to experiment locally by changing CSS values for particular HTML element e.g. increase / decrease border around image, changing font sizes for all images etc.

But in Chrome dev tool , I’m not able to find corresponding source code file for that HTML element .

If I goto Sources tab there is no way to locate that element in the source code.

Please clarify

On the webpage, position your mouse over the element/area you’re interested.
Then right-click --> Inspect