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Contrast
There’s quite a bit going on with contrast here. First, the use of blues and oranges creates something of a complementary relationship across the page. It makes elements such as the headings and the “edit” buttons stand out against the background, and really distinguishes the header from the rest of the page. The darker blue used in the navigation tabs easily shows us which tab we’re in, the white text against the orange in the header distinguishes the main title of the site, etc., etc.