Fixing the font-size for the Mathjax plugin in WordPress

Mathjax is a fantastic plugin for WordPress that renders your latex code in a wonderful way. However as with the other Latex renders the font-size can be a bit small. The CSS field on the settings page is not working for some reason, but there is a simple way to remedy that. In your theme CSS file just add

.MathJax_Display {
font-size: 1.5em;

where the numerical value is of course set to what looks good on your site.

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