Dull Blue

CSS

:root {
  --dull-blue: #49759c;
  --dull-blue-rgb: 73 117 156;
  --dull-blue-oklch: oklch(0.547 0.078 246.6);
}

.element {
  color: var(--dull-blue);
  background-color: hsl(208 36% 45%);
  border-color: oklch(0.547 0.078 246.6);
}

Tailwind CSS v4

@theme {
  --color-dull-blue: #49759c;
  --color-dull-blue-50: #e4f8ff;
  --color-dull-blue-100: #d4ebff;
  --color-dull-blue-200: #bbd8f5;
  --color-dull-blue-300: #99bbde;
  --color-dull-blue-400: #78a3cb;
  --color-dull-blue-500: #598bb7;
  --color-dull-blue-600: #4c769b;
  --color-dull-blue-700: #3d5e7c;
  --color-dull-blue-800: #2a455c;
  --color-dull-blue-900: #1c3040;
  --color-dull-blue-950: #0c1c29;
}

SCSS

$dull-blue: #49759c;
$dull-blue-rgb: 73, 117, 156;
$dull-blue-light: mix(#fff, $dull-blue, 20%);
$dull-blue-dark: mix(#000, $dull-blue, 20%);

.element {
  color: $dull-blue;
  box-shadow: 0 0 0 2px rgba($dull-blue, 0.35);
}