paper-scroll-header-panel- allow content be able to scroll underneath header for transparent style?

[Darin Hensley]

I wanted to make a static paper-scroll-header-panel with a translucent background....just like the one on https://events.google.com/io2015/. This way, my background image of the main content will show through the header when I scroll down.  

But, with the way paper-scroll-header-panel is....the Y scrollbar stops at the edge of paper-scroll-header-panel. So, even when the background is transparent the main content background image will not show through it when scrolling...because the main content will not scroll underneath the paper-scroll-header-panel.  

How can I go about making the a paper-scroll-header-panel (which will be nested in paper-drawer-panel) transparent and be able to have the background content scroll underneath a transparent background paper-scroll-header-panel? 

                                                                                                                      VS

[Lx8 Co]

I have the same question. Did you get an answer?