Scrollbar of DIV with position FIXED is partly hidden behind window scrollbar

Question

I have a table of contents in my page (see here) with these CSS styles:

div.toc {
    height:38em;
    position:fixed;
    right:0;
    top:5em;
    width:21em;
    z-index:1;
}

How do I have to change these settings to make sure the DIV isn't partially hidden behind the body/window scroll bar?

(Tested with Firefox 3.6 and Opera 10.10).

Answer 1

Actually, your div.toc is properly positioned. The problem is with your <iframe>.

Remember your box model... width and height is calculated independently from the margin and padding...

So, by having width: 100%; on your iframe.toc plus a margin-left: 0.5em, you are basically telling the browser the following:

Use the full width of the parent element and offset it 0.5em to the left.
Total effective width: 100% + 0.5em

What you really want to say is the following:

Substract 0.5em from the full width of the parent element to use as padding on the left and use this as width.
Total effective width: 100% - 0.5em (desired)

The solution is therefore simple... Remove the margin-left from iframe.toc and put a padding-left: 0.5em on div.toc.

div.toc {
    background-color: #f0f0f0;
    position: fixed;
    top: 5em;
    right: 0;
    width: 21em;
    height: 38em;
    padding-left: .5em;
    border-left: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
    border-top: 1px solid #ccc;
    z-index: 1;
}

iframe.toc {
    background-color: #f0f0f0;
    border: 0;
    width: 100%;
    height: 30em;
    border-bottom: 1px solid #ccc;
}

Answer 2

You can make you table of contents position 1 em from the right like this: right: 1em;

I just tried it for you and right: 1em; looks good.