#006CCA

CSS

:root {
  --matt-blue: #006cca;
  --matt-blue-rgb: 0 108 202;
  --matt-blue-oklch: oklch(0.534 0.167 253.6);
}

.element {
  color: var(--matt-blue);
  background-color: hsl(208 100% 40%);
  border-color: oklch(0.534 0.167 253.6);
}

Tailwind CSS v4

@theme {
  --color-matt-blue: #006cca;
  --color-matt-blue-50: #d6f8ff;
  --color-matt-blue-100: #c3ebff;
  --color-matt-blue-200: #a4d8ff;
  --color-matt-blue-300: #7cbaff;
  --color-matt-blue-400: #4fa1fe;
  --color-matt-blue-500: #1986f1;
  --color-matt-blue-600: #1a72cb;
  --color-matt-blue-700: #155ba3;
  --color-matt-blue-800: #04437a;
  --color-matt-blue-900: #042e56;
  --color-matt-blue-950: #001b3a;
}

SCSS

$matt-blue: #006cca;
$matt-blue-rgb: 0, 108, 202;
$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);
}