CSS fix in wordpress theme

Hi All,

I would like to ask you for a quick take a look at this site:
http://guistyles.com

I’ve increased sidebar banner to 160×600: (you will see it when you take a look at ‘single post’ view)

http://guistyles.com/2014/02/07/surf-wallpaper/

160 is too width in Google Chrome & Safari. In Internet Explorer and Firefox sidebar looks ok but in Chrome&Safari goes too far to the right.

It is hard to wrote what exactly i mean and i don’t see attachment option here but hope you will see that bug.

What i would like to ask you is to take a look at CSS file, maybe i need to add there some small code to fix that bug.

Hope to find here some help.

Thanks for reading,
Piotr