An easy way to do this would be to simply change the Theme on the page in question to a different theme. You can specify the heading and body fonts in any theme, so changing the theme that page uses (and the font settings within the theme) is the easiest way to do that.
Another option would be to use an HTML content block, wrap your text in a Div tag, and then use the CSS tab to address that div to manually change the font.
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Another option would be to use an HTML content block, wrap your text in a Div tag, and then use the CSS tab to address that div to manually change the font.
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