does the given information on this page: https://confluence.atlassian.com/display/DOC/Styling+Fonts+in+Confluence help you?
If you want to export your Confluence content to PDF with your own look and feel you could have a look at our Scroll PDF Exporter giving you full control of the styles in your exported PDF file.
If you'd like to change the font used in Confluence UI, you can change that using CSS as explained in this doc:https://confluence.atlassian.com/display/DOC/Styling+Fonts+in+Confluence
Do you use templates with Confluence? Take part in a remote 1-hr workshop. You'll receive USD $100 for your time! We're looking for people to participate in a remote 1-hr workshop...
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