Adjust Column Width

I’d like to adjust the column widths on all pages. Specifically, I’d like the main section to be 780px (or 65%) and the right column to be 420px (or 35%). I can’t seem to find how to adjust these widths in CSS. You can see the current widths here. Thanks so much!


Your URL in above are not working, so I go to this page to checking your site and here is the css code that you need:

div#primary.col-md-9 {
    width: 65%;
div#secondary.col-md-3 {
    width: 35%;

you can put the css code above using simple custom css plugin

Thank you so much! Really appreciate you taking the time to help me solve this. Worked perfectly!