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I am new to the designing/programming world so I am sure the issue is easy to solve. I am trying to add the moz-box-shadow effect to my header. But as soon as I add that component, the header which is taking up space horizontally shortens up. I want the header to be like Twitter's, where they use a shadow effect.

#header {
    background-color: #990000;
    -moz-box-shadow: 1px 1px 10px #D7D7D7;

Also, the way I have set the width is it likely going to create cross browser issues?

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Could you upload a little screen snippet that clearly shows the effect you are trying to achieve? Pardon my ignorance, but I don't use Twitter, and its difficult to find an example of this. Thanks – Philip Regan Feb 9 '11 at 21:49
You might be better of posting this at stackoverflow. That said, the box-shadow attribute should have no affect on layout at all. So, there's likely something else going on. We really need to see your entire page (ie, a link) – DA01 Feb 9 '11 at 23:02
This is not a Graphic Design question. And you probably will have some browsers issues. Especially since you're using a mozilla specific attribute. And it should have no effect on your code. – Johannes Feb 10 '11 at 4:07
@Philip Regan: I've been reading those metas as well. But this does seem to be directly related to code. And while I agree that the scope of this site should increase, to take topics directly covered on other SEs would just make finding answers, overall, more difficult, don't you think? – Johannes Feb 10 '11 at 14:55
I'm going to suggest that we move the discussion on whether or not this is on topic to the meta site. I've already opened a question, see… – PearsonArtPhoto Feb 10 '11 at 20:10
up vote 3 down vote accepted

There is a known bug with box-shadow in some browsers which has been documented but not resolved yet.

For cross compatible CSS code (not sure it'll validate with the vendor prefixes) use this:

.shadow {
        -moz-box-shadow: 3px 3px 4px #000;
        -webkit-box-shadow: 3px 3px 4px #000;
        box-shadow: 3px 3px 4px #000;
        /* For IE 8 */
        -ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000')";
        /* For IE 5.5 - 7 */
        filter: progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000');

You could forgo all this and just use a BG image, 25px wide and whatever you want tall, with the drop shadow as you want. Save it as a 24bit PNG and it will render as pretty as you see in Photoshop.

As an aside, questions about CSS/HTML should go on and not here, this is a site for Graphic Design. Questions about website design should go on

Hope some of this helps :)

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The width:101.3% will probably not cause cross browser issues, but it will cause your page to always show vertical scrollbar.

What will cause cross browser issues is the -moz-box-shadow effect, which is Firefox specific. See Kyle Sevenoaks' answer for how to support all browsers with the shadow effect.

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