Marshal Blue

CSS

:root {
  --marshal-blue: #3e4355;
  --marshal-blue-rgb: 62 67 85;
  --marshal-blue-oklch: oklch(0.386 0.031 272.7);
}

.element {
  color: var(--marshal-blue);
  background-color: hsl(227 16% 29%);
  border-color: oklch(0.386 0.031 272.7);
}

Tailwind CSS v4

@theme {
  --color-marshal-blue: #3e4355;
  --color-marshal-blue-50: #f2f5fe;
  --color-marshal-blue-100: #e4e7f3;
  --color-marshal-blue-200: #d0d4e2;
  --color-marshal-blue-300: #b2b7c8;
  --color-marshal-blue-400: #989eb2;
  --color-marshal-blue-500: #7f859c;
  --color-marshal-blue-600: #6b7184;
  --color-marshal-blue-700: #565a69;
  --color-marshal-blue-800: #3e424e;
  --color-marshal-blue-900: #2b2e36;
  --color-marshal-blue-950: #181a21;
}

SCSS

$marshal-blue: #3e4355;
$marshal-blue-rgb: 62, 67, 85;
$marshal-blue-light: mix(#fff, $marshal-blue, 20%);
$marshal-blue-dark: mix(#000, $marshal-blue, 20%);

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