I'm working on a simple website for a friend. Its based on Twenty Ten theme and I've bought the Custom CSS upgrade and did some minor tweaks (I'm very new to CSS).
I have set a custom header size in the Custom CSS (to 940x400px) and when I set a featured image on one of the pages the image gets the wrong proportions. I have all the images in the right size to start with (940x400px).
I've tried to change the default image width in the Custom CSS page to 940px instead of the default 640px but it does not solve the issue
Is there a way to fix this with only the Custom CSS upgrade? In that case how?
The blog I need help with is stockholmhf.wordpress.com.