You got it backward. The custom CSS of the website is overriding the system styles in this case. Let's take font-family for example. Just because you're setting

You got it backward. The custom CSS of the website is overriding the system styles in this case. Let's take font-family for example. Just because you're setting the font for your input[text] tags doesn't mean the browser will also automatically set the font for other elements to match the style. If you want the website to have uniform look, then you'll need to set the font-family for other elements, too.