I would suggest inspecting the HTML elements and the styles applied to them. You can follow the suggestions in the first two points of the Improve Your Debugging Skills with Chrome DevTools blog post explaining how to inspect the generated HTML and check the applied styles for various elements.
Once you know the styles you need to override, you can use the same style selector and add "html body " in front of it to make it more specific, "stronger". More on CSS specificity you can find here:
Hope this will help to achieve the desired result.
Regards,
Valentin Dragnev
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