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Imagine I want to visit (or an other website) everyday but I want to change the blue color of header (change it to red for instance).

Is it possible to force personal css styles when I visit a website? If so, how can I do it? Maybe a web browser tip or a plugin? (I use Chrome)

I would like an automatic solution, change css with web browser console (F12 on Chrome) for each page I visit is not interesting.

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migrated from Mar 4 '13 at 10:41

This question came from our site for pro webmasters.

up vote 4 down vote accepted

The general concept you're after is "user stylesheets."
Stylish (Chrome / Firefox) gives you an easy way to manage per-site styles and toggle them on/off as needed.

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Thanks Su'! But unfortunately it doesn't work in private browsing mode. – Zistoloen Mar 4 '13 at 13:21

Greasemonkey ... a google search pointed me to Tampermonkey (

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While technically you can modify the styling of documents with Grease/Tampermonkey, it's not really what they're intended for, at least not in isolation. Userscripts are more suited to messing with the actual function (and sometimes structure) of pages. – Su' Mar 4 '13 at 10:21

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