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HTML

              
                <section>
  <h1>CSS Color-Contrast() - Target Contrast Demo</h1>

  <p>Using the CSS color-contrast() function, we're able to define our target contrast ratio. This feature is currently (18.3.2022) only available via the <a href="https://developer.apple.com/safari/technology-preview/">Safari Technology Preview</a> browser.</p>

  <div class="sample-block">
    <p>Target Ratio: <span>AA (4.5)</span></p>
  </div>

  <form>
    <label>
      Ratio Keywords
      <select id="ratio-keywords">
        <option value="AA (4.5)" selected>AA (4.5)</option>
        <option value="AA-Large (3)">AA-Large (3)</option>
        <option value="AAA (7)">AAA (7)</option>
        <option value="AAA-Large (4.5)">AAA-Large (4.5)</option>
      </select></label>

    <label>
      Custom Ratio
      <input id="custom-ratio" type="range" min=0 max=20 value="4.5" step="0.1" />
    </label>

  </form>

  <p>🚀 Use the form controls to adjust the target contrast ratio.</p>
</section>

<div class="not-supported">The color-contrast() feature is not supported in your browser.</div>
              
            
!

CSS

              
                body {
  --contrast-target: AA;
}

.sample-block {
  --color-set: #001219, #005f73, #0a9396, #94d2bd, #e9d8a6, #ee9b00, #ca6702,
    #bb3e03, #ae2012, #9b2226;
  --base: color-contrast(
    var(--body-base) vs var(--color-set) to var(--contrast-target)
  );

  background: var(--base);
  display: grid;
  padding: 0.75em 1em;
  place-items: center;

  p {
    color: color-contrast(var(--base) vs var(--color-set), #fff to AA-Large);
  }
}

/* GLOBAL */
:root {
  --body-base: #001219;
  --color-primary: #005f73;
  --scrollbar-bg: #222;
}

body::-webkit-scrollbar {
  width: 10px;
}
body {
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary) var(--scrollbar-bg);
}
body::-webkit-scrollbar-track {
  background: var(--scrollbar-bg);
}
body::-webkit-scrollbar-thumb {
  background-color: var(--color-primary);
  border-radius: 6px;
  border: 3px solid var(--scrollbar-bg);
}

html,
body {
  color: #fff;
  font-family: "Barlow", sans-serif;
  font-size: 100%;
  letter-spacing: 0.25px;
  line-height: 1.75;
  margin: 0;
  padding: 0;
}

body {
  accent-color: #ee9b00;
  background-image: radial-gradient(
    circle farthest-corner at 100% 0,
    var(--color-primary) 0%,
    var(--color-primary) 15.9%,
    #ee9b00 15.9%,
    #ee9b00 24.4%,
    var(--body-base) 24.5%,
    var(--body-base) 66%
  );
  block-size: 100%;
  display: grid;
  min-block-size: 100vh;
  place-items: center;
}

a {
  color: #e9d8a6;
  text-decoration: underline 1px dashed;
  text-underline-offset: min(5px, 1em);

  &:hover {
    color: #ffe8d6;
  }

  &:focus {
    outline: 1px solid currentColor;
    outline-offset: 3px;
  }
}

h1,
h2 {
  font-family: "Hubballi", cursive;
  line-height: 1.25;
}

section {
  inline-size: min(750px, 50vw);
}

form {
  display: grid;
  grid-gap: 2rem;
  grid-template-columns: 1fr 1fr;
  padding-block-end: 1rem;
}

label {
  display: grid;
  font-size: 1.2rem;
  font-weight: 600;
}

select,
input {
  display: block;
}

.not-supported {
  background: #600;
  border-radius: 8px;
  color: #fff;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  position: fixed;
  inset-block-end: 1rem;
  inset-inline-start: 1rem;

  @supports (background: color-contrast(#000 vs #fff, #eee)) {
    display: none;
  }
}

              
            
!

JS

              
                document.querySelector("#ratio-keywords").addEventListener("change", (e) => {
  document.body.style.setProperty("--contrast-target", e.target.value);
  document.querySelector(".sample-block span").innerHTML = e.target.value;
});

document.querySelector("#custom-ratio").addEventListener("input", (e) => {
  document.body.style.setProperty("--contrast-target", e.target.value);
  document.querySelector(".sample-block span").innerHTML = e.target.value;
});

              
            
!
999px

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