Luminescent Blue

CSS

:root {
  --luminescent-blue: #a4dde9;
  --luminescent-blue-rgb: 164 221 233;
  --luminescent-blue-oklch: oklch(0.862 0.06 212.1);
}

.element {
  color: var(--luminescent-blue);
  background-color: hsl(190 61% 78%);
  border-color: oklch(0.862 0.06 212.1);
}

Tailwind CSS v4

@theme {
  --color-luminescent-blue: #a4dde9;
  --color-luminescent-blue-50: #e3faff;
  --color-luminescent-blue-100: #d2eef4;
  --color-luminescent-blue-200: #b8dbe4;
  --color-luminescent-blue-300: #94c0ca;
  --color-luminescent-blue-400: #74a8b3;
  --color-luminescent-blue-500: #53919e;
  --color-luminescent-blue-600: #477b85;
  --color-luminescent-blue-700: #39626b;
  --color-luminescent-blue-800: #28484e;
  --color-luminescent-blue-900: #1b3236;
  --color-luminescent-blue-950: #0b1e21;
}

SCSS

$luminescent-blue: #a4dde9;
$luminescent-blue-rgb: 164, 221, 233;
$luminescent-blue-light: mix(#fff, $luminescent-blue, 20%);
$luminescent-blue-dark: mix(#000, $luminescent-blue, 20%);

.element {
  color: $luminescent-blue;
  box-shadow: 0 0 0 2px rgba($luminescent-blue, 0.35);
}