CSS3 box shadow effect not working in opera

问题

I am having a menu which uses Css3 effects on its hover and active state.The menu looks like this

Here is the Css3 styling I use

#Menu a:active,
#Menu a.active:before,#Menu a:hover:before
{
    Content: ' ';
    position:absolute;
    z-index:51;
    width:0px;
    height:0px;
    left:50%;
    top:50%;
    box-shadow:0 0 35px 30px #ADD7E7;
    -moz-box-shadow:0 0 35px 30px  #ADD7E7;
    -webkit-box-shadow:0 0 35px 30px  #ADD7E7;
    border-radius:50%;


}

This works in Firefox and Chrome , but doesnot work in opera , I have no idea , can anybody help me out with this.Any help is much appreciated. Thanks

回答1:

It seems Opera needs the pseudo element to have a width and height (other than 0px). Just tried the following code in Opera 11.62 and it appeared to work.

#Menu a:active,
#Menu a.active:before,#Menu a:hover:before
{
    Content: '';
    position:absolute;
    z-index:51;
    width:1px;
    height:1px;
    left:50%;
    top:50%;
    background: #ADD7E7;
    box-shadow:0 0 35px 30px #ADD7E7;
    -moz-box-shadow:0 0 35px 30px  #ADD7E7;
    -o-box-shadow:0 0 35px 30px  #ADD7E7;
    border-radius:50%;
}

回答2:

Try this code

HTML

<div class="shadow-bringer shadow"> HI ! Welcome. </div>

CSS

.shadow-bringer {
    background: none repeat scroll 0 0 #FFFFA2;
    height: 100px;
    margin: 20px auto;
    padding: 5px;
    width: 100px;
}
.shadow {
    box-shadow: 0 0 8px #CCCCCC;
    -moz-box-shadow: 0px 0px 8px #ccc;/* for mozila*/
-webkit-box-shadow: 0px 0px 8px #ccc;
    /* For IE upto 5.5 not for 9*/
filter: progid:DXImageTransform.Microsoft.Shadow(color='#cccccc', Direction=45, Strength=3)
progid:DXImageTransform.Microsoft.Shadow(color='#cccccc', Direction=135, Strength=3)
progid:DXImageTransform.Microsoft.Shadow(color='#cccccc', Direction=225, Strength=3)
progid:DXImageTransform.Microsoft.Shadow(color='#cccccc', Direction=315, Strength=3);
}

For more info visit : 1.http://webdesignergeeks.com/tutorials/html-css-tutorials/cross-browser-drop-shadow-for-all-side/

2.http://css-tricks.com/snippets/css/css-box-shadow/

回答3:

According css3please, this should work :

.box_shadow {
  -webkit-box-shadow: 0px 0px 4px 0px #ffffff; /* Saf3-4, iOS 4.0.2 - 4.2, Android 2.3+ */
  box-shadow: 0px 0px 4px 0px #ffffff; /* Opera 10.5, IE9, FF4+, Chrome 6+, iOS 5 */
}

Check whether this works in your opera : http://css3please.com/

来源：https://stackoverflow.com/questions/10477517/css3-box-shadow-effect-not-working-in-opera

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