CSS Blurry Shimmer Effect - Smashing Magazine
Briefly

Imagine box-shadow but for a blur effect, where the backdrop of an element is blurred around that element, gradually decreasing the blur's strength. - Yair Even Or
It would be awesome if we had a box-blur property or perhaps some sort of blur keyword we could set on box-shadow the way we do for inset shadows. Unfortunately, CSS has no such property. But because CSS is awesome and flexible, we can still get the effect by combining a few CSS features and hack it through. - Yair Even Or
Read at Smashing Magazine
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