It is hard for me to explain but look here http://www.hrvatska-zajednica.com/test/ Look at footer you see how it fill whole display. I try to make it, but I failed. Look http://www.hrvatska-zajednica.com/test/Untitled-1.htm
Your Untitled-1.htm page only has some css code on it, it cannot show anything. You will need to complete that page with the html code from the first page and change the text content that is visible to the visitor.