The theme includes a number of options to extend the background color of all main areas (header, menu, content, footer...) and /or their content to the full width of the browser.

1- To extend all background attributes, for main Theme areas, you can use the "Extend BG Attributes" options. For other areas or you own content containers, you can simply use the wvrx-fullwidth class, as explained in the tips and tutorial thread here: Full Width Designs. This is the method used on this page.

2- If you simply need to extend the color, you can also use the Full Width BG options found in the main areas. This technique is used in the Plus Plugin page of this site.
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THIS AREA HAS A BACKGROUND IMAGE, BORDER, AND SHADOW
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed vehicula consectetur nisi, a mattis diam interdum ac. Sed ipsum velit, pharetra id pellentesque ac, dictum non dui. Curabitur quis aliquam purus.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed vehicula consectetur nisi, a mattis diam interdum ac. Sed ipsum velit, pharetra id pellentesque ac, dictum non dui. Curabitur quis aliquam purus.