How to keep text at 100% but make background opaque 0.8

I am making a fund me type page for a friend who was hurt in the line of duty. I am trying to keep the text at 100% without any changes but make the background opaque enough to see the background image pretty clearly. Any suggestions would be welcome.

Just use RGBA for the background.

Like this:

The last value (0.8) is opacity. It won’t affect the text or other elements inside that dive like global opacity does.
Just remember to remove the background color from the body.