Is it possible to use background images and background color with opacity

Hello, I’m interested in using background image along with background color with opacity (not sure what the right term is for that) in various sectionsof the page. I have see it being used in the following page (in the section right above the footer).

http://unicon.hellominti.com/home/home-slider-only/

I would greatly appreciate it, if you could provide me hint on how to achieve this.

Thank you.

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