Chrome extension -- 2

I'd like to create a chrome extension that injects a sidebar into all webpages. This sidebar would be injected on the left hand side and would have a width of 10vw. I'd like the rest of the page to shrink to 90vw and appear in that space (as if the viewport had always been 90vw). The effect is similar to what happens when you open chrome console on the right hand side. The console pops up and the rest of the page shrinks to the remaining width and appears as if that width had been there originally