I’ve created a website for a relative. However, after making the whole thing, the relative says she didn’t understand that the design pictures I sent her were scaled 1:1, so she wants the website “bigger” (basically the same thing as pressing Ctrl+plus in Firefox).
Do I have to redo all CSS and design, or is there a better way to do this?
You have several options, but either way you’re looking at rewriting some CSS. Your choice will depend upon the actual website.
Move to a larger fixed width site. Keep in mind that 960px wide is about your maximum for this. This will account for browser chrome at 1024×768.
Change over to a fluid width site. This site will expand to fit your browser. If your site is heavy on graphic elements, this might not be your best option. However, many people like a site expanding to fit their whole browser window.