#0B6EBE

CSS

:root {
  --matt-blue: #0b6ebe;
  --matt-blue-rgb: 11 110 190;
  --matt-blue-oklch: oklch(0.531 0.149 250.7);
}

.element {
  color: var(--matt-blue);
  background-color: hsl(207 89% 39%);
  border-color: oklch(0.531 0.149 250.7);
}

Tailwind CSS v4

@theme {
  --color-matt-blue: #0b6ebe;
  --color-matt-blue-50: #d8f9ff;
  --color-matt-blue-100: #c5ecff;
  --color-matt-blue-200: #a7d9ff;
  --color-matt-blue-300: #7ebcff;
  --color-matt-blue-400: #54a3f3;
  --color-matt-blue-500: #2289e4;
  --color-matt-blue-600: #2074c0;
  --color-matt-blue-700: #1a5d9b;
  --color-matt-blue-800: #0a4573;
  --color-matt-blue-900: #072f51;
  --color-matt-blue-950: #001b36;
}

SCSS

$matt-blue: #0b6ebe;
$matt-blue-rgb: 11, 110, 190;
$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);
}