Taking inspiration from shadows, author Yair Even Or creates the same sort of thing, only with a blurring effect in place of the shadow. Read along for a step-by-step explanation of how it comes together using a combination of masks, gradients, and the good ol’ `backdrop-filter` property.

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Learn how to create a blurry shimmer effect using CSS by combining properties such as box-shadow, backdrop-filter, and gradients. The effect adds depth to designs and can be applied to elements like popups or tooltips.

CSS Blurry Shimmer Effect — Smashing Magazine

Refining Using The mask-composite Property

<p>This is a never-before-seen effect</p>
