box-shadow does not work in internet explorer
If you’re using box-shadow as a CSS property in your Internet Explorer 9 and the box-shadow does not show you might want to check if:
You’re using the right syntaxys – you can check if the property appears in the developers window (F12) for the current element.
If this does not help you might want to know, that box-shadow is supported for Internet Explorer 9+, so if you are using
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE8" />
in your page with Internet Explorer 9 or if you are using Internet Explorer 8 (or lower) box-shadow will not work.
If you want a similar effect in Internet Explorer 8 read this article.