[thelist] css "transparency"

Tue Sep 24 17:15:01 CDT 2002

Close.

The lion image is the background image of the <body> tag, set to not repeat
and stay "fixed" in the top-left corner:

body	{
      ...
	background : #fff url(../images/lion_lightblue.gif) no-repeat fixed
top left;
	}

(It's at http://www.nypl.org/styleguide/images/contentfill.gif -- you
probably won't see it, but it's there.)

Then there's a div on the page:

<div class="content">...</div>

That holds all the text on the page.

The style definition for the content class specifies a background-image:

.content {
    padding: 10px 20px;
    margin: 5% 15%;
    border: 1px dotted #333;
    background-image: url(../images/contentfill.gif);
}

It's actually a relatively small image and could be even smaller.  But, I
think that the default behavior is to tile background-images, so it gets
repeated (tiled) however big the DIV is.  The image consists of a pattern
like this:

X X X X X
 X X X X
X X X X X
 X X X X

(Sorry, can't think of a name for that pattern.)  Every space above would be
a white picel, while every X would be a pixel with 100% transparency, or
vice versa -- doesn't matter.  (100% or 0% transparent is all the
transparency options you have in GIF format.)

This basically emulates a DIV with a white background that's 50%
transparent.  The human eye just can't tell that there are little tiny
alternating dots there.

HTH,
Greg

-----Original Message-----
From: Paul Bennett [mailto:paul at teltest.com]
Sent: Tuesday, September 24, 2002 4:00 PM
To: thelist at lists.evolt.org
Subject: Re: [thelist] css "transparency"

Thanks for all the help and links - so just to see if I have this straight:
The content div actually has no "translucency" (giving the thesaurus a
hammering today...) but has a seperate bg image to the body. This is fixed
in positon to sit over the body image but provide a new image effect
(distortion / translucency etc). As it is set not to scroll, it stays static
as the content div scrolls and gives the illusion of translucency in the
content div.

?

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