custom css resets for brave

[lucidNTR]

Did you search for similar issues before submitting this one?
yes

Describe the issue you encountered:
a lot of style issues arise because standard css rules are not for electron applications and devs need to remember overriding bad UX standards

eg:
#4355

or
#4509

recomendations:
box-sizing: border-box; (simpler box model)
-webkit-user-select: none; (non selectable text is standard outside of webviews)
*:focus {
outline: none; (no focus outlines)
}

[luixxiul]

cc @bradleyrichter

[luixxiul]

Implement normalize.css should be the proper solution here.