Breaking down CSS Box Shadow vs. Drop Shadow | CSS-Tricks - CSS-Tricks
html - CSS box-shadow with transparent background and pseudo elements - Stack Overflow
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Josh W. Comeau on Twitter: "🔥 `box-shadow` doesn't work well with transparent images. `filter: drop-shadow` does what you'd expect, adding a shadow to the image's contents. .my-img { filter: drop-shadow(1px 2px 3px
Amazing CSS3 Box Shadow Examples
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Comparison of CSS Shadow Effect: drop-Shadow and box-Shadow | Develop Paper