#236EBA

CSS

:root {
  --matt-blue: #236eba;
  --matt-blue-rgb: 35 110 186;
  --matt-blue-oklch: oklch(0.533 0.139 252.5);
}

.element {
  color: var(--matt-blue);
  background-color: hsl(210 68% 43%);
  border-color: oklch(0.533 0.139 252.5);
}

Tailwind CSS v4

@theme {
  --color-matt-blue: #236eba;
  --color-matt-blue-50: #dbf8ff;
  --color-matt-blue-100: #c9ebff;
  --color-matt-blue-200: #acd8ff;
  --color-matt-blue-300: #85bbfd;
  --color-matt-blue-400: #5ea2ee;
  --color-matt-blue-500: #3588df;
  --color-matt-blue-600: #2f74bc;
  --color-matt-blue-700: #255c97;
  --color-matt-blue-800: #154470;
  --color-matt-blue-900: #0e2f4f;
  --color-matt-blue-950: #021b35;
}

SCSS

$matt-blue: #236eba;
$matt-blue-rgb: 35, 110, 186;
$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);
}