Shady Blue

CSS

:root {
  --shady-blue: #42808a;
  --shady-blue-rgb: 66 128 138;
  --shady-blue-oklch: oklch(0.563 0.066 209.1);
}

.element {
  color: var(--shady-blue);
  background-color: hsl(188 35% 40%);
  border-color: oklch(0.563 0.066 209.1);
}

Tailwind CSS v4

@theme {
  --color-shady-blue: #42808a;
  --color-shady-blue-50: #e1fbff;
  --color-shady-blue-100: #d0eef4;
  --color-shady-blue-200: #b5dce4;
  --color-shady-blue-300: #91c1cb;
  --color-shady-blue-400: #6faab3;
  --color-shady-blue-500: #4d929e;
  --color-shady-blue-600: #427c85;
  --color-shady-blue-700: #34636b;
  --color-shady-blue-800: #24494e;
  --color-shady-blue-900: #183336;
  --color-shady-blue-950: #091e21;
}

SCSS

$shady-blue: #42808a;
$shady-blue-rgb: 66, 128, 138;
$shady-blue-light: mix(#fff, $shady-blue, 20%);
$shady-blue-dark: mix(#000, $shady-blue, 20%);

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