This tutorial will teach you how you can resize the column width in Brio Responsive Theme for Plone 4.1-4.3
Brio diazo theme has customizable columns width. Default left column width is 178px, while right column width is 229px
You can change columns width via Site Setup -> Diazo Theme-> Advanced Settings tab.
Note: For Diazo Support extension starting with 1.1b1 version, proceed to Site Setup ->Theming -> Advanced Settings tab.
Specify new values for columnonewidth and columntwowidth parameters in Parameter Expressions textarea. Let's for example set column one width 200px, column two width - 250px. Don't forget to save the changes. Now when we return to the home page: