Decoration Blue

CSS

:root {
  --decoration-blue: #3f74a3;
  --decoration-blue-rgb: 63 116 163;
  --decoration-blue-oklch: oklch(0.543 0.093 247.2);
}

.element {
  color: var(--decoration-blue);
  background-color: hsl(208 44% 44%);
  border-color: oklch(0.543 0.093 247.2);
}

Tailwind CSS v4

@theme {
  --color-decoration-blue: #3f74a3;
  --color-decoration-blue-50: #e1f8ff;
  --color-decoration-blue-100: #d1ebff;
  --color-decoration-blue-200: #b6d8fb;
  --color-decoration-blue-300: #93bce6;
  --color-decoration-blue-400: #70a4d3;
  --color-decoration-blue-500: #4f8bc1;
  --color-decoration-blue-600: #4476a3;
  --color-decoration-blue-700: #365e83;
  --color-decoration-blue-800: #254561;
  --color-decoration-blue-900: #183044;
  --color-decoration-blue-950: #091c2c;
}

SCSS

$decoration-blue: #3f74a3;
$decoration-blue-rgb: 63, 116, 163;
$decoration-blue-light: mix(#fff, $decoration-blue, 20%);
$decoration-blue-dark: mix(#000, $decoration-blue, 20%);

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