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Our fonts should all be in Arial, and if possible, try to stick with only changing the fonts by remaining in "full html" mode (you can check this at the bottom of any page you are editing) and simply toggling between Heading 1, Heading 2, paragraph, etc on the editing toolbar. You can change the the font sizes (or font itself if necessary) by switching to the filtered html setting at the bottom of any page you are editing. Once you have finished changing the font, switch back to the "full html" setting before saving your changes.
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