'chrome is injecting some stylesheet in popup ui which reduces the font size to 75%

I'm designing the popup UI of the extension, default font size of browser is 16px and when I view the design outside the extension environment the default font size is 16px, but when I open the UI, chrome injects some stylesheet which reduces the font size to 75% which is equal to 12px.

How can I prevent this behaviour?

check my screenshot below.

enter image description here



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