how to have the same hover image for many images - html

Question

I have a few pictures in a table that they work as a link and in hover a play button should appear over them.
I tried many different tricks but they all have problems which dont work properly. I decieded to share my question here to find an standard solution.
Here is what I have done so far:
img{
position: relative;
}
img:hover:before {
background:url(http://i40.tinypic.com/i3s4dc.png) no-repeat center center;
content:"";
width: 100%;
min-height: 100px;
position: absolute;
left: 0;
}
I dont know if I am in the right direction or not, but have a look at the demo http://jsfiddle.net/jmXdh/8/ and if it is wrong then please let me know any other way.

Answer 1

You unfortunately can't use the ::before and ::after pseudo-elements with replaced elements. The content of all replaced elements is outside the scope of CSS.
From the Generated and Replaced Content Module (WD):
Replaced elements do not have '::before' and '::after' pseudo-elements; the 'content' property in the case of replaced content replaces the entire contents of the element's box.

Answer 2

Here's something that might work, assuming you can add additional markup:
http://jsfiddle.net/isherwood/jmXdh/11/
a {
display: inline-block;
overflow: hidden;
position: relative;
}
a:hover .play {
background:url(http://placehold.it/80x80) no-repeat center center;
opacity: 0.8;
position: absolute;
width: 80px;
height: 80px;
left: 50%;
top: 50%;
margin-left: -40px;
margin-top: -50px;
}
<a href="/">
<div class="play"></div>
<img class="img" src="http://i42.tinypic.com/2v9zuc1.jpg" />
<br />
<b>Video test</b>
</a>
Or with a transition effect:
http://jsfiddle.net/isherwood/jmXdh/12/
.play {
opacity: 0;
transition: opacity 0.3s;
}
a:hover .play {
opacity: 0.7;
}