[Plugin: WP AD Gallery] Error show thumbnails

Hello:

I installed the plugin but the thumbnails appear very big.

I’ve modified the css and changing this line:.

. post img {max-width: 100% height: auto;}

for this:

. post img {max-width: 100%;}

The thumbnails looks good in explorer , but do not look good in chrome.

How I can see them well???

Thank you!

https://www.ads-software.com/extend/plugins/wp-ad-gallery/