At http://sodesigns.co.uk/roots/

Depending on the browser, depends on whether the font inside the posts displays correctly. It's all meant to be Arial and the Header font H1-H2 and the body text is also Arial at 13pt. How can I do this as a mass change? There is 3000+ posts so I cannot change the tags for all of them.

* {font-family:arial,sans-serif;}

Considering all (or atleast majority) of the styles are set to inherit, why don't you just try adding an arial stack. To do so, try the following:

body {
font-family: Arial, Helvetica, sans-serif
}

If its still not working, just be more specific

html body {
font-family: Arial, Helvetica, sans-serif
}

You can very easily target specifically nested tags. Like this:

body div#content div.posts div.single-post h1, body div#content div.posts div.single-post h2 {
font-family: Arial, Helvetica, sans-serif
}
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