Hello, I am using Twenty Twelve with one-column setting.
I tried to change the width from 960px to 640px, but I could not succeed after all.
Here is the page I would like to adjust.
Here is the content of style.css file of my child theme.
[no need to post CSS - it's all visible on your site ]
As I failed to adjust the child theme successfully, I also tried replacing all the number '960' with '640', but nothing happend.
The page I pasted in the beginning is showing the articles from a certain category, not all the articles.
I sincerely appreciate your help.