Blue Sentinel

CSS

:root {
  --blue-sentinel: #546e77;
  --blue-sentinel-rgb: 84 110 119;
  --blue-sentinel-oklch: oklch(0.521 0.034 221.1);
}

.element {
  color: var(--blue-sentinel);
  background-color: hsl(195 17% 40%);
  border-color: oklch(0.521 0.034 221.1);
}

Tailwind CSS v4

@theme {
  --color-blue-sentinel: #546e77;
  --color-blue-sentinel-50: #ebf7fc;
  --color-blue-sentinel-100: #ddebf0;
  --color-blue-sentinel-200: #c6d8df;
  --color-blue-sentinel-300: #a6bcc4;
  --color-blue-sentinel-400: #89a3ad;
  --color-blue-sentinel-500: #6e8c96;
  --color-blue-sentinel-600: #5d767f;
  --color-blue-sentinel-700: #4a5f66;
  --color-blue-sentinel-800: #36454a;
  --color-blue-sentinel-900: #253034;
  --color-blue-sentinel-950: #131c1f;
}

SCSS

$blue-sentinel: #546e77;
$blue-sentinel-rgb: 84, 110, 119;
$blue-sentinel-light: mix(#fff, $blue-sentinel, 20%);
$blue-sentinel-dark: mix(#000, $blue-sentinel, 20%);

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