Knowledge Base

Just add this css code in Dashboard > Appearance > Theme Options > Layout > Custom Css & Js > Enable Css > Yes > Paste the css code inside the text area > Save All.

or

Get into Admin panel > Appearance > Theme Option > Integration > General > Custom CSS > Enable Custom CSS  > Yes > Paste the below css code inside the text area > Save All.

#primary { width: 820px; }
#secondary, #secondary-right, #secondary-left { width: 350px; }

or

#primary { width:75%; }
#secondary, #secondary-right, #secondary-left { width: 25%; }

Note: You can change the width value as per your need.