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Smooth Concentric Radial Gradient in CSS

I'm trying to create a blurry donut shape like this on a canvas with js. I tried

gradient.addColorStop(0, "rgba(0, 0, 0, .1)");
gradient.addColorStop(0.5, "rgba(128, 128, 128, .1)");
gradient.addColorStop(1, "rgba(0, 0, 0, .1)");

But I only get enter image description here

It has a distinct defined circle at the stop radius. What I want is a smooth falloff. Something like this..

enter image description here

Is this possible?

Via Active questions tagged javascript - Stack Overflow https://ift.tt/cJpSbIP
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