I can add the image. Where do you want the opacity, on the image?
image + opacity
Sent a PR
Fixes background images.
Re-positions the background for opacity changes.
Adds admin page with opacity setting.
I re-positioned the bg so that opacity doesn't affect the text. And there's an admin page where you can adjust the opacity.
@yariplus thank you man!
edit: text shadow?
@lombisi Added text shadow to the PR.