Circular gradient in ring shape with CSS

How can I create a "ring" shape with a specific thickness (in pixels) using radial gradient in HTML and CSS? I want to achieve a smooth color transition from green to transparent, like this:

https://i.sstatic.net/mF54O.png

Currently, my code only produces a solid circle without the desired thickness. Here is what I have so far:

 div {
  background-image: radial-gradient(transparent, green, transparent);
  border-radius: 100%;
  height: 300px;
  width: 300px;
}
<div></div>

I am looking for a solution using only HTML and CSS, without resorting to canvas or SVG (fiddle). I need the flexibility to adjust the width and thickness of the ring shape dynamically without relying on an image.

cssradial-gradients

Answer №1

If you're looking to experiment with CSS radial gradients, check out this website.

I was able to achieve the desired effect you want. Take a look at this demonstration I created. Feel free to adjust the percentages to customize the output.

div {
    background: radial-gradient(circle, rgba(0,128,0,0) 50%, rgba(0,128,0,1) 60%, rgba(0,128,0,0) 70%);
    width: 300px;
    height: 300px;
}
<div></div>

Answer №2

If you're looking for a way to achieve a thickness of exactly 50px, this solution is perfect for you. You can easily customize it by adjusting the variable:

.box {
  --t:50px;
  
  background:
    radial-gradient(farthest-side,transparent calc(100% - var(--t)), green, transparent 100%);
  display:inline-block;
  height: 250px;
  width: 250px;
}
<div class="box"></div>
<div class="box" style="--t:80px;"></div>
<div class="box" style="--t:100px"></div>

Answer №3

div {
  background-image: radial-gradient(transparent, transparent 100px, green 150px, transparent 200px, transparent);
  border-radius: 100%;
  height: 300px;
  width: 300px;
}
<div></div>

Feel free to adjust the pixel values as needed. The syntax for the gradient is as follows: 

radial-gradient(color width, color width, color width, ...)
. The width can be specified using various CSS units such as px, rem, or %.

Answer №4

Although it's not an exact replica, the similarity is striking. The key is to utilize a mask technique.

div {
  border-radius:50%;
  background:linear-gradient(green, green, green);
  -webkit-mask: radial-gradient(transparent 330px, #000 90px);
          mask: radial-gradient(transparent 330px, #000 90px);
}
div:before {
  content:"";
  display:block;
  padding-top:100%;
}

<div class="box"></div>

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