I need help making solid forum sections and headers semi-transparent!

[LyricTheBard]

Hi there! I'm painfully new to the CSS scene and honestly have no idea what I'm doing. All I want to do is to somehow make the solid colors in the forum sections and the headers of my site about 80% semi-transparent without affecting any of the text or the background and logo images. I've done some searching, and people have provided codes for similar problems, but being a beginner, I have no real idea what to do with them. This is the only thing I want to mess with as far as coding goes. Help me please!

My forum is here: http://talesfromalbion.forumotion.com.

I'd like for the background image to be sort of visible through the white and dark grey areas, to match my other website http://talesfromalbion.weebly.com.

[Zed is Not Dead]

Hey there, try this code out!

Code:

.bodyline
{ 
  background-image: url("");
  background-position: right bottom;
  background-repeat: no-repeat;
  filter:alpha(opacity=90); -moz-opacity: 0.9; opacity: 0.9;
  border-radius: 25px;
-webkit-border-radius: 25px;
-moz-border-radius: 25px;
-o-border-radius: 25px;
-khtml-border-radius: 25px;
}

You paste that into the CSS section to get there click Admin Pannel-Displays-Colors-CSS Style Sheet, then paste and save and see if it works, note leave the background section blank unless you want it to overlap the one you have now

[LyricTheBard]

Thank you, Zed is Not Dead, but I tried it and it didn't work. :C Thank you for being so helpful, though!

[SLGray]

There will be an issue with this because all the categories have the same CSS selector. Because of this, you would not be able to add different images to the categories.

[LyricTheBard]

I don't want to add different images. I just want to take what is already there and make it semi-transparent.

[LyricTheBard]

I figured it out myself! I used this code:

Code:

body {
opacity:0.8;
filter:alpha(opacity=80);
}

It worked for me. Made everything on top of the background transparent, rather than just a few specific areas, though. How can I change it so that it affects everything except the logo? It's not incredibly important; I can deal with it as it is, but it'd be nice to be able to make it a bit more specific.