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"most of the time it's dead easy.
Find out identifier / selector via developer tools
Apply your style to the selected element like font-size or background-color"
are the css requests i made all about 'finding out 'identifier / selector' via developer tools'?
how do you recognise what's what?**
is 'identifier / selector' css or js? is this advanced knowledge to learn?
That's why sometimes advanced understanding is needed. You won't get that in two weeks.