How do I edit the CSS of the top navigation bar in SharePoint Online? Specifically, I would like to edit the font size.

1 Answer 1



  • Classic Experiences, with your own CSS overruling ms- selectors (CSS Specificity)

  • Modern Experiences, not possible (or not yet as Microsoft keeps saying since May 2016)

  • Thanks, Danny. I am using the classic experience. Which anchors/classes would I be altering specifically?
    – Adrian
    Feb 8, 2017 at 19:30
  • Open up F12 console and check yourself. I don't know all that stuff by heart.. its hundreds of selectors and depends on what you want to do.. Feb 8, 2017 at 20:58

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