#326FAB

CSS

:root {
  --matt-blue: #326fab;
  --matt-blue-rgb: 50 111 171;
  --matt-blue-oklch: oklch(0.531 0.114 250.5);
}

.element {
  color: var(--matt-blue);
  background-color: hsl(210 55% 43%);
  border-color: oklch(0.531 0.114 250.5);
}

Tailwind CSS v4

@theme {
  --color-matt-blue: #326fab;
  --color-matt-blue-50: #dff8ff;
  --color-matt-blue-100: #cdebff;
  --color-matt-blue-200: #b2d8ff;
  --color-matt-blue-300: #8dbbf1;
  --color-matt-blue-400: #69a3df;
  --color-matt-blue-500: #468ace;
  --color-matt-blue-600: #3c75ae;
  --color-matt-blue-700: #305e8c;
  --color-matt-blue-800: #1f4568;
  --color-matt-blue-900: #143049;
  --color-matt-blue-950: #061c30;
}

SCSS

$matt-blue: #326fab;
$matt-blue-rgb: 50, 111, 171;
$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);
}