#206FB7

CSS

:root {
  --matt-blue: #206fb7;
  --matt-blue-rgb: 32 111 183;
  --matt-blue-oklch: oklch(0.532 0.135 250.6);
}

.element {
  color: var(--matt-blue);
  background-color: hsl(209 70% 42%);
  border-color: oklch(0.532 0.135 250.6);
}

Tailwind CSS v4

@theme {
  --color-matt-blue: #206fb7;
  --color-matt-blue-50: #daf8ff;
  --color-matt-blue-100: #c8ecff;
  --color-matt-blue-200: #abd8ff;
  --color-matt-blue-300: #84bcfb;
  --color-matt-blue-400: #5ca3eb;
  --color-matt-blue-500: #338adb;
  --color-matt-blue-600: #2d75b9;
  --color-matt-blue-700: #245d95;
  --color-matt-blue-800: #14456f;
  --color-matt-blue-900: #0d304e;
  --color-matt-blue-950: #011c34;
}

SCSS

$matt-blue: #206fb7;
$matt-blue-rgb: 32, 111, 183;
$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);
}