Column Width CSS

Hi,

I have adapted the code here (https://www.qualtrics.com/community/discussion/443/custom-side-by-side-question-with-7-columns) for 6 columns, and would like to change the width of the 1, 2, 4, and 5 columns to be smaller, and the 3 and 6 columns to be wider. How do I do this?

Thank you!
Katie