In your css file, check: Check the opening and closing braces (Incorrect braces can result in the browser not rendering all following styles.) Check that you are using colons (:) and semicolons (;) correctly Check the selectors (element, #id, .class, element.class). If using an id or class, check the spelling of the id and/or class against its spelling in the html file. Check the spelling of the actual styles and values