Customizing OJS Journal Content
https://docs.pkp.sfu.ca/designing-your-journal/en/
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The OJS software has serveral theme backgrounds for you to choose from. The default is a green color. Once logged in as the Journal Manager, go to Setup, then The Look, section 5.6 "Journal Layout." There you can select from a drop-down menu which journal theme (background color/style) you would like. Click save and continue to test the theme out.
