Sheet Blue

CSS

:root {
  --sheet-blue: #52616f;
  --sheet-blue-rgb: 82 97 111;
  --sheet-blue-oklch: oklch(0.485 0.029 246.6);
}

.element {
  color: var(--sheet-blue);
  background-color: hsl(209 15% 38%);
  border-color: oklch(0.485 0.029 246.6);
}

Tailwind CSS v4

@theme {
  --color-sheet-blue: #52616f;
  --color-sheet-blue-50: #eff6fd;
  --color-sheet-blue-100: #e1e9f1;
  --color-sheet-blue-200: #cbd6e0;
  --color-sheet-blue-300: #acb9c6;
  --color-sheet-blue-400: #91a1af;
  --color-sheet-blue-500: #778899;
  --color-sheet-blue-600: #657381;
  --color-sheet-blue-700: #515c67;
  --color-sheet-blue-800: #3a444c;
  --color-sheet-blue-900: #282f35;
  --color-sheet-blue-950: #161b20;
}

SCSS

$sheet-blue: #52616f;
$sheet-blue-rgb: 82, 97, 111;
$sheet-blue-light: mix(#fff, $sheet-blue, 20%);
$sheet-blue-dark: mix(#000, $sheet-blue, 20%);

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