CSS Fix for Website

I have a website that I've downloaded. It used to be a blog but I downloaded each of the pages using a site download utility which converted all pages to straight HTML. The trouble I'm having is the page looks perfect when I open it locally on my computer, but when I upload to my web server the layout isn't correct and the side bar is below all of the content. My feeling is it's a quick CSS fix but I'm not good with CSS. I need someone who can 1.) find the error and get the site working properly 2.) make the global changes on all pages for the site (can likely be done using a global Search & replace tool). This project needs to be done quick! I will provide the URL of the site and FTP access for the winner.