Transparent Site Background

I am trying to create a transparent site background (section) as I wish to have a full-page static image and a container overlay with content.

I have tried to set this in the theme and page settings (rgba,0,0,0,0) but all I get is a mid-grey in the editor and white on the front end. I can set a colour but not transparency. What am I doing wrong? I tried disabling all templates and creating a new default template but all I get once again is a mid grey when RGB Alpha is set to zero. I have also cleared the site background colour so that nothing is set but that also appears to default to white.

I do have automatic.css installed and have set the Website Background Color to rgba(0,0,0,0). I’ve disabled Automatic.css and the issue still manifests itself in bricks.

I hope somebody can help me resolve this issue.

Thanks in advance.

I have just tried a complete new install of Wordpress and Bricks 1.9.7.1, no other plugins and I still can’t get the transparency to work.