Running Magento 1.9.3
I have installed the Fishpig Multisite extension and it is working fine, all talking to each other, but the layout is terrible.
I have followed the customisation instructions on the fishpig website, but no changes I make in the styles.css alter the layout.
Any ideas?
Here's a screenshot to show the bad layout: 
This sometimes happen if you haven't closed all elements insight your editor. So you should check that first.
If that is not the problem then look if the container is set to
display: block;. You can find the element name with the Developer-Tools in your Browser.