I am developing my first website and almost done. However, the contents of the pages are contained within a wrapper that I am using to try and centre the content and then have a background image to fill the rest of the screen. This works well except the wrapper is not always centred and also the background image has a join where it repeats. This despite having the attributes of "no-repeat" and "centre" for the background image etc.
How do I have the HTML and CSS handle different browsers and resolutions etc and have things always centred?
Thanks in advance for any guidance