#316BC1

CSS

:root {
  --matt-blue: #316bc1;
  --matt-blue-rgb: 49 107 193;
  --matt-blue-oklch: oklch(0.535 0.148 258.4);
}

.element {
  color: var(--matt-blue);
  background-color: hsl(216 60% 47%);
  border-color: oklch(0.535 0.148 258.4);
}

Tailwind CSS v4

@theme {
  --color-matt-blue: #316bc1;
  --color-matt-blue-50: #ddf7ff;
  --color-matt-blue-100: #cce9ff;
  --color-matt-blue-200: #b0d6ff;
  --color-matt-blue-300: #8bb8ff;
  --color-matt-blue-400: #669ff5;
  --color-matt-blue-500: #4384e6;
  --color-matt-blue-600: #3970c2;
  --color-matt-blue-700: #2e5a9c;
  --color-matt-blue-800: #1c4274;
  --color-matt-blue-900: #122e52;
  --color-matt-blue-950: #051a37;
}

SCSS

$matt-blue: #316bc1;
$matt-blue-rgb: 49, 107, 193;
$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);
}