3 Types of CSS Styles:

• Inline
• External
• Internal

Most sites have CSS scattered around all these 3 types.

That one query which clears all CSS from a page.

HitF12 to open the console from the Developer tool.

CtrlC this command:

document.querySelectorAll('style,link[rel="stylesheet"]').forEach(style=>style.remove());

Then,CtrlV in the console.
HitEnter , et Voilà!