Adjusting width

Dolphin is very well now to adjust the width of the page, but I happened a problem, if it is not for everyone, if they adjust to less than 947px to see blogs. The page seems wrong, the module of the post is not reduced, and another column appears below, in Explorer looks good to 947px in firefox but needs 957. I thought put it in 900px, I hope that someone can see this in its installation and even leave a comment.