I\'m trying to have an app that fit the window size of the browser.
The menu should have a height that fit 100% of the parent and not have a height of 100% of the sc
For main containers like these, it's best to use 100vh and 100vw.
Read here about the modern CSS units: http://tutorialzine.com/2015/05/simplify-your-stylesheets-with-the-magical-css-viewport-units/
Don't forget to use inherit
as much as possible on children elements (when it works). This way you ensure a proper cascade of height elements.