IE8 ignores absolute positioning and margin:auto
- by tuff
I have a lightbox-style div with scrolling content that I am trying to restrict to a reasonable size within the viewport. I also want this div to be horizontally centered. This is all easy in Fx/Chrome/IE9.
My problem is that IE8 ignores the absolute positioning which I use to size the content, and the rule margin: 0 auto which I use to horizontally center the lightbox.
1) Why? 2) What are my options for workarounds?
EDIT: The centering issue is fixed by setting text-align:center on the parent element, but I have no idea why that works since the element I want to center is not inline. Still stuck on the absolute positioning stuff.
HTML:
<div class="bg">
<div class="a">
<div class="aa">titlebar</div>
<div class="b">
<!-- many lines of content here -->
</div>
</div>
</div>
CSS:
body { overflow: hidden; height: 100%; margin: 0; padding: 0; }
/* IE8 needs ruleset above */
.bg {
background: #333;
position: fixed;
top: 0; right: 0; bottom: 0; left: 0;
height: 100%; /* needed in IE8 or the bg will only be as tall as the lightbox */
}
.a {
background: #eee; border: 3px solid #000;
height: 80%; max-height: 800px; min-height: 200px;
margin: 0 auto;
position: relative;
width: 80%; min-width: 200px; max-width: 800px;
}
.aa {
background: lightblue;
height: 28px; line-height: 28px;
text-align: center;
}
.b {
background: coral;
overflow: auto;
padding: 20px;
position: absolute;
top: 30px; right: 0; bottom: 0; left: 0;
}
Here's a demo of the problem: http://jsbin.com/urikoj/1/edit
