#326EB1

CSS

:root {
  --matt-blue: #326eb1;
  --matt-blue-rgb: 50 110 177;
  --matt-blue-oklch: oklch(0.532 0.123 253.2);
}

.element {
  color: var(--matt-blue);
  background-color: hsl(212 56% 45%);
  border-color: oklch(0.532 0.123 253.2);
}

Tailwind CSS v4

@theme {
  --color-matt-blue: #326eb1;
  --color-matt-blue-50: #def8ff;
  --color-matt-blue-100: #cdebff;
  --color-matt-blue-200: #b2d7ff;
  --color-matt-blue-300: #8dbaf6;
  --color-matt-blue-400: #68a2e5;
  --color-matt-blue-500: #4588d5;
  --color-matt-blue-600: #3b74b4;
  --color-matt-blue-700: #2f5d90;
  --color-matt-blue-800: #1e446b;
  --color-matt-blue-900: #142f4b;
  --color-matt-blue-950: #061b32;
}

SCSS

$matt-blue: #326eb1;
$matt-blue-rgb: 50, 110, 177;
$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);
}