#006AC9

CSS

:root {
  --matt-blue: #006ac9;
  --matt-blue-rgb: 0 106 201;
  --matt-blue-oklch: oklch(0.529 0.169 254);
}

.element {
  color: var(--matt-blue);
  background-color: hsl(208 100% 39%);
  border-color: oklch(0.529 0.169 254);
}

Tailwind CSS v4

@theme {
  --color-matt-blue: #006ac9;
  --color-matt-blue-50: #d6f8ff;
  --color-matt-blue-100: #c3ebff;
  --color-matt-blue-200: #a5d7ff;
  --color-matt-blue-300: #7cbaff;
  --color-matt-blue-400: #50a0ff;
  --color-matt-blue-500: #1c85f2;
  --color-matt-blue-600: #1b71cc;
  --color-matt-blue-700: #165ba4;
  --color-matt-blue-800: #05437a;
  --color-matt-blue-900: #042e56;
  --color-matt-blue-950: #001a3a;
}

SCSS

$matt-blue: #006ac9;
$matt-blue-rgb: 0, 106, 201;
$matt-blue-light: mix(#fff, $matt-blue, 20%);
$matt-blue-dark: mix(#000, $matt-blue, 20%);

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