How to auto resize a circle in an ::after pseudo element?

Question

I\'m trying to create a circle as an ::after pseudo element, which resizes automatically depending on its content.

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Answer 1

Don't put actual content in the pseudo-element especially as this is actually "content" rather than styling, rather use the pseudo-element to create a background circle using the padding/aspect ratio trick.

body {
  text-align: center;
}

.divider {
  margin: 3em;
  display: inline-block;
  position: relative;
  padding: 1em;
  font-weight: bold;
}

.divider:after {
  content: "";
  position: absolute;
  width: 100%;
  padding-top: 100%;
  background: lightblue;
  border-radius: 50%;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: -1;
}

<div class="divider">OR</div>

<div class="divider">LONG TEXT</div>

Answer 2

Here is a trick using radial-gradient. The idea is to keep the element full height and color it using circle closest-side which will always create a circle that will start from the center and expand to the closest sides (left and right one)

I simplified the code to keep only the relevant part:

.container {
  display: flex;
  flex-direction: row;
  margin:10px;
}

.left {
  flex: 1 1 auto;
  background-color: yellowgreen;
  height: 200px;
}

.right {
  flex: 1 1 auto;
  background-color: dodgerblue;
}

.divider {
  background-color: white;
  width: 6px;
  font-weight: 800;
  display: flex;
  justify-content: center;
}

.divider::after {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  content: attr(data-text);
  padding: 0 8px;
  background: radial-gradient(circle closest-side, white 98%, transparent 100%);
  z-index: 10;
}

<div  class="container">
  <div class="left "></div>
  <div class="divider" data-text="OR"></div>
  <div class="right "></div>
</div>

<div class="container">
  <div class="left "></div>
  <div class="divider" data-text="longer"></div>
  <div class="right "></div>
</div>

<div class="container">
  <div class="left "></div>
  <div class="divider" data-text="even longer"></div>
  <div class="right "></div>
</div>