Browser often have the built-in possibility to use an individual CSS stylesheet. Which determins the colours of the fonts and the background too.
There exist even interchange places in the web, were one can get such things. If self not familiar with such fucking PC shit.
Such an individual stylesheet has the highest priority. What does that mean? That means, equal, what the fucking designer made, one has the higher right to determin, how the site looks.
Sammys computerexplanations 