Steel Blue

CSS

:root {
  --steel-blue: #4682b4;
  --steel-blue-rgb: 70 130 180;
  --steel-blue-oklch: oklch(0.588 0.099 245.7);
}

.element {
  color: var(--steel-blue);
  background-color: hsl(207 44% 49%);
  border-color: oklch(0.588 0.099 245.7);
}

Tailwind CSS v4

@theme {
  --color-steel-blue: #4682b4;
  --color-steel-blue-50: #e0f8ff;
  --color-steel-blue-100: #ceecff;
  --color-steel-blue-200: #b3d9fd;
  --color-steel-blue-300: #8fbce8;
  --color-steel-blue-400: #6ba4d6;
  --color-steel-blue-500: #488cc4;
  --color-steel-blue-600: #3e76a5;
  --color-steel-blue-700: #315f85;
  --color-steel-blue-800: #214662;
  --color-steel-blue-900: #163045;
  --color-steel-blue-950: #071c2d;
}

SCSS

$steel-blue: #4682b4;
$steel-blue-rgb: 70, 130, 180;
$steel-blue-light: mix(#fff, $steel-blue, 20%);
$steel-blue-dark: mix(#000, $steel-blue, 20%);

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