Blog width

Hi!

I was wondering how I can easily extend the width of my blog. Idealy I would like it half the width of the screen (with a resolution of 1280×1024). What of the code do I need to edit? I have looked throug the CSS sheet and tried to adjust some commands but do not get the desidered effect. I guess I’m looking at the wrong ones…

Many thanks if you can help.

My blog is https://www.bluntedpresents.co.uk