#093D4E

CSS

:root {
  --cold-and-dark: #093d4e;
  --cold-and-dark-rgb: 9 61 78;
  --cold-and-dark-oklch: oklch(0.336 0.059 225.5);
}

.element {
  color: var(--cold-and-dark);
  background-color: hsl(195 79% 17%);
  border-color: oklch(0.336 0.059 225.5);
}

Tailwind CSS v4

@theme {
  --color-cold-and-dark: #093d4e;
  --color-cold-and-dark-50: #e5f9ff;
  --color-cold-and-dark-100: #d4ecf8;
  --color-cold-and-dark-200: #bbdae8;
  --color-cold-and-dark-300: #98becf;
  --color-cold-and-dark-400: #79a6b9;
  --color-cold-and-dark-500: #5a8fa4;
  --color-cold-and-dark-600: #4c798b;
  --color-cold-and-dark-700: #3d616f;
  --color-cold-and-dark-800: #2b4751;
  --color-cold-and-dark-900: #1d3139;
  --color-cold-and-dark-950: #0d1d23;
}

SCSS

$cold-and-dark: #093d4e;
$cold-and-dark-rgb: 9, 61, 78;
$cold-and-dark-light: mix(#fff, $cold-and-dark, 20%);
$cold-and-dark-dark: mix(#000, $cold-and-dark, 20%);

.element {
  color: $cold-and-dark;
  box-shadow: 0 0 0 2px rgba($cold-and-dark, 0.35);
}