In the Cyberchimps responsive theme the max-width is set to 960px to accomodate iphones I suppose. How do you make maximum width responsive itself, so that on large desktop screens you get 1440px or 90% wigth or similar, while on mobile screens you get 960px width or 90% etc. I've tried using percentages but my header which has a 1440px width jpeg always overshoots to the left ot the right of the container below it. I've taken the header outside of the container hook. It's on it's own. I'm a beginner at WP and trawling through tutorials for help. There might be a CSS command I'm not aware of that does this.