Hi there - I am really new to this but am working on a child theme of twentytwelve.
I was plugging along making the modifications in my custom theme stylesheet when I noticed that the css is (automatically?) referencing media=all. When using a code inspector that is what I am seeing, and I am seeing the effects visually as well, of course. I had been making changes successfully for a while and then hit this wall ;(. I can't seem to get my css to override this css.
Here is a link to my testing site: http://heattreatforum.flyten.net/
I will be using media queries moving forward to make this site fluid (it's so not right now) so I don't want to delete them from the twentytwelve stylesheet (plus isn't that bad practice??)
Any ideas?