Mallard Blue

CSS

:root {
  --mallard-blue: #3f6378;
  --mallard-blue-rgb: 63 99 120;
  --mallard-blue-oklch: oklch(0.481 0.053 235.1);
}

.element {
  color: var(--mallard-blue);
  background-color: hsl(202 31% 36%);
  border-color: oklch(0.481 0.053 235.1);
}

Tailwind CSS v4

@theme {
  --color-mallard-blue: #3f6378;
  --color-mallard-blue-50: #e8f8ff;
  --color-mallard-blue-100: #d8ebf8;
  --color-mallard-blue-200: #c0d8e9;
  --color-mallard-blue-300: #9ebcd0;
  --color-mallard-blue-400: #80a4ba;
  --color-mallard-blue-500: #638ca5;
  --color-mallard-blue-600: #54778b;
  --color-mallard-blue-700: #435f70;
  --color-mallard-blue-800: #304652;
  --color-mallard-blue-900: #203039;
  --color-mallard-blue-950: #101c23;
}

SCSS

$mallard-blue: #3f6378;
$mallard-blue-rgb: 63, 99, 120;
$mallard-blue-light: mix(#fff, $mallard-blue, 20%);
$mallard-blue-dark: mix(#000, $mallard-blue, 20%);

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