Not to hand, for sharing here, but just try it with something like your CV, in neat HTML. Set yourself some rules to not use classes (for the lols, not out of ideological hatred) or divs (there is always a better element).

If you can't do it, there is probably more work to do with your document structure. Also try and always have a h1-h6 heading in your articles, sections, asides and even navs, at the top. Headings should not be in a sea of paragraphs, they should be at the top of a content sectioning element, nowhere else.