#226BC9

CSS

:root {
  --matt-blue: #226bc9;
  --matt-blue-rgb: 34 107 201;
  --matt-blue-oklch: oklch(0.536 0.162 256.8);
}

.element {
  color: var(--matt-blue);
  background-color: hsl(214 71% 46%);
  border-color: oklch(0.536 0.162 256.8);
}

Tailwind CSS v4

@theme {
  --color-matt-blue: #226bc9;
  --color-matt-blue-50: #daf7ff;
  --color-matt-blue-100: #c7eaff;
  --color-matt-blue-200: #aad6ff;
  --color-matt-blue-300: #84b8ff;
  --color-matt-blue-400: #5b9ffc;
  --color-matt-blue-500: #3384ef;
  --color-matt-blue-600: #2d70c9;
  --color-matt-blue-700: #235aa2;
  --color-matt-blue-800: #134279;
  --color-matt-blue-900: #0c2e55;
  --color-matt-blue-950: #011a39;
}

SCSS

$matt-blue: #226bc9;
$matt-blue-rgb: 34, 107, 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);
}