Page with transparency imposing on slider – howto?

Hallo,
I’m very satisfied user of the Vantage plugin. I’m looking a way to create a look similar to this website:

http://bit.ly/2kCDP1y

My goal is to have a big slider with the “text page” with overlaps slider. As you see on this example background of the text page “Whatever you’re looking…” is optically white – transparent, and overlaps slider.

I’d like to have same look on evry single page, I mean homepage and any other which I open from menu, so probably there is a some magic to do in the Custom CSS Editor but unfortunately I can’t find way to achieve this goal. Can you please help my somhow?