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to your site css. If you don't already have a custom css file you may want to: -In "All files" create a folder named "styles" if it doesn't already exist. - Make a file and name it "global.css" or w/e you want - Edit your Master Page a file with the sufix ".master" to include your newly created css file like: <link rel="stylesheet" type="text/css" href="/sites/SiteName/styles/Global.css" />