In the Blue

CSS

:root {
  --in-the-blue: #9eb0bb;
  --in-the-blue-rgb: 158 176 187;
  --in-the-blue-oklch: oklch(0.747 0.026 234.6);
}

.element {
  color: var(--in-the-blue);
  background-color: hsl(203 18% 68%);
  border-color: oklch(0.747 0.026 234.6);
}

Tailwind CSS v4

@theme {
  --color-in-the-blue: #9eb0bb;
  --color-in-the-blue-50: #eff6fc;
  --color-in-the-blue-100: #e0e9ef;
  --color-in-the-blue-200: #cad6de;
  --color-in-the-blue-300: #acbac3;
  --color-in-the-blue-400: #90a1ac;
  --color-in-the-blue-500: #768995;
  --color-in-the-blue-600: #64747e;
  --color-in-the-blue-700: #505d65;
  --color-in-the-blue-800: #3a444a;
  --color-in-the-blue-900: #282f33;
  --color-in-the-blue-950: #161c1f;
}

SCSS

$in-the-blue: #9eb0bb;
$in-the-blue-rgb: 158, 176, 187;
$in-the-blue-light: mix(#fff, $in-the-blue, 20%);
$in-the-blue-dark: mix(#000, $in-the-blue, 20%);

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