The Extra Theme’s “Blog Feed Standard” module is styled with a top border bar. The color of this bar is determined by the color of the category of posts being shown, or in the case of the “all” category a default color is used (#00a8ff). If you want to override the color used, here’s a couple of ways to do it.
Changing the Blog Feed Standard accent color via the module options
To change the accent color on a single blog feed standard module, you can use the custom CSS option within the module settings. In the module settings, go to the Advanced (formerly Custom CSS) tab and enter the following in the “Main Element” box:
This will change the bar to red, and will work whatever categories are selected for display.
Changing the Blog Feed Standard Accent Color via CSS
Another way to change the accent color is using CSS. The following CSS snippet will change the accent color for all instances of the module:
To add the CSS code to Extra, paste it into Extra's custom CSS box, which you can find from your WordPress admin menu at "Extra > Theme Settings > General > Custom CSS". Paste it after any other code already in there.