#54A6BB

CSS

:root {
  --true-sky-blue: #54a6bb;
  --true-sky-blue-rgb: 84 166 187;
  --true-sky-blue-oklch: oklch(0.682 0.085 216.7);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(192 43% 53%);
  border-color: oklch(0.682 0.085 216.7);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #54a6bb;
  --color-true-sky-blue-50: #dbfcff;
  --color-true-sky-blue-100: #c9effb;
  --color-true-sky-blue-200: #acdeed;
  --color-true-sky-blue-300: #85c2d5;
  --color-true-sky-blue-400: #5fabbf;
  --color-true-sky-blue-500: #3394ab;
  --color-true-sky-blue-600: #2d7d90;
  --color-true-sky-blue-700: #246474;
  --color-true-sky-blue-800: #174a55;
  --color-true-sky-blue-900: #0f333b;
  --color-true-sky-blue-950: #021f25;
}

SCSS

$true-sky-blue: #54a6bb;
$true-sky-blue-rgb: 84, 166, 187;
$true-sky-blue-light: mix(#fff, $true-sky-blue, 20%);
$true-sky-blue-dark: mix(#000, $true-sky-blue, 20%);

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