Manhattan Blue

CSS

:root {
  --manhattan-blue: #404457;
  --manhattan-blue-rgb: 64 68 87;
  --manhattan-blue-oklch: oklch(0.391 0.033 275.5);
}

.element {
  color: var(--manhattan-blue);
  background-color: hsl(230 15% 30%);
  border-color: oklch(0.391 0.033 275.5);
}

Tailwind CSS v4

@theme {
  --color-manhattan-blue: #404457;
  --color-manhattan-blue-50: #f3f4ff;
  --color-manhattan-blue-100: #e5e7f3;
  --color-manhattan-blue-200: #d0d3e3;
  --color-manhattan-blue-300: #b3b6c8;
  --color-manhattan-blue-400: #999db2;
  --color-manhattan-blue-500: #80859c;
  --color-manhattan-blue-600: #6c7084;
  --color-manhattan-blue-700: #565a6a;
  --color-manhattan-blue-800: #3f424e;
  --color-manhattan-blue-900: #2b2d36;
  --color-manhattan-blue-950: #181a21;
}

SCSS

$manhattan-blue: #404457;
$manhattan-blue-rgb: 64, 68, 87;
$manhattan-blue-light: mix(#fff, $manhattan-blue, 20%);
$manhattan-blue-dark: mix(#000, $manhattan-blue, 20%);

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