Astronaut Blue

CSS

:root {
  --astronaut-blue: #214559;
  --astronaut-blue-rgb: 33 69 89;
  --astronaut-blue-oklch: oklch(0.373 0.054 235.1);
}

.element {
  color: var(--astronaut-blue);
  background-color: hsl(201 46% 24%);
  border-color: oklch(0.373 0.054 235.1);
}

Tailwind CSS v4

@theme {
  --color-astronaut-blue: #214559;
  --color-astronaut-blue-50: #e7f8ff;
  --color-astronaut-blue-100: #d8ebf8;
  --color-astronaut-blue-200: #c0d8e9;
  --color-astronaut-blue-300: #9ebcd0;
  --color-astronaut-blue-400: #80a4ba;
  --color-astronaut-blue-500: #638ca5;
  --color-astronaut-blue-600: #54778b;
  --color-astronaut-blue-700: #435f70;
  --color-astronaut-blue-800: #2f4652;
  --color-astronaut-blue-900: #203039;
  --color-astronaut-blue-950: #0f1c24;
}

SCSS

$astronaut-blue: #214559;
$astronaut-blue-rgb: 33, 69, 89;
$astronaut-blue-light: mix(#fff, $astronaut-blue, 20%);
$astronaut-blue-dark: mix(#000, $astronaut-blue, 20%);

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