Chrome vs the rest

I have made some changes for a client on their website.

They asked me to swith around a content area with a slider on the home page. In Chrome the site renders correctly, but when viewed in any other browser everything looks wrong.

The URL for the site where I made the changes is demo.blankbook.co.za

Do anyone have any idea as to what might be the reason for them displaying SO different in the different browsers?

I simply changed around the Slider container and the content conatiner in the index.php file. Then I added a margin to the CSS file for the slider container, and I had to change the background image as well.