The new WordPress default theme, Twenty Ten, is awesome but one thing that annoys me about it was the fact it’s single column template isn’t full width but instead just removing the sidebar and centering the content. It’s really easy to change that though so here’s how I did it:

1. Under Appearance click Editor to open the theme editor
2. If it isn’t already click on “Stylesheet (style.css)” on the right hand side (somewhere near the bottom)
3. Now look for the following section of code (Ctrl+F will come in helpful here to find it) and change the width here from 640px to 900px then hit the Update File button:

Now when you view pages which use the one column template they should fill the same amount of space that both the content and sidebar usually do.