<div>Primary</div>
<pre class="language-css">
<code>
:root {
  --primary-hue: 250;
  --primary-saturation: 100%;
  --primary-lightness: 90%;
  --primary-light: hsl(
    var(--primary-hue) var(--primary-saturation) var(--primary-lightness)
  );
  --on-primary-light: hsl(var(--primary-hue) var(--primary-saturation) 10%);
}

div {
  background-color: var(--primary-light);
  color: var(--on-primary-light);
}
</code>
</pre>

@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;
  font-family: "Exo", Arial, sans-serif;
  background-color: #f9f9f9;
  padding: 20px;

  display: grid;
  gap: 10px;
  place-content: center;
}

:root {
  --primary-hue: 250;
  --primary-saturation: 100%;
  --primary-lightness: 90%;
  --primary-light: hsl(
    var(--primary-hue) var(--primary-saturation) var(--primary-lightness)
  );
  --on-primary-light: hsl(var(--primary-hue) var(--primary-saturation) 10%);
}

div {
  width: 30vmin;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--primary-light);
  color: var(--on-primary-light);
}