What is this style called?

I am trying to find the name of the style of the following websites. It's a mix of classic bootstrap and material design. But instead of full material design it offers more depth and just looks a lot nicer.

I've seen more of this style lately and would like to know more about it. I really like the simple card style, especially the dropdown menu card on this site. There always seems to be some overlay of one element into another.