At smaller breakpoints when the sidenav collapses into the hamburger configuration, if you invoke the menu an overlay covers the main content area, but the Clipboard / CodePen area of demo snippet is over top of the overlay and still accessible. Not specific to Polymer 2.
At smaller breakpoints when the sidenav collapses into the hamburger configuration, if you invoke the menu an overlay covers the main content area, but the Clipboard / CodePen area of demo snippet is over top of the overlay and still accessible. Not specific to Polymer 2.