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Animate gradient background css [duplicate]

I'm trying to transition on hover with css over a thumbnail so that on hover, the background gradient fades in. The transition isn't working, but if I simply change it to an rgba() value, it works fine. Are gradients not supported? I tried using an image too, it won't transition the image either.

I know it's possible, as in another post someone did it, but I can't figure out how exactly. Any help> Here's some CSS to work with:

#container div a {   -webkit-transition: background 0.2s linear;   -moz-transition: background 0.2s linear;   -o-transition: background 0.2s linear;   transition: background 0.2s linear;   position: absolute;   width: 200px;   height: 150px;   border: 1px #000 solid;   margin: 30px;   z-index: 2 }  #container div a:hover {   background: -webkit-gradient(radial, 100 75, 100, 100 75, 0, from(rgba(0, 0, 0, .7)), to(rgba(0, 0, 0, .4))) } 
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