Dark Slate Blue

CSS

:root {
  --dark-slate-blue: #214761;
  --dark-slate-blue-rgb: 33 71 97;
  --dark-slate-blue-oklch: oklch(0.383 0.062 240.9);
}

.element {
  color: var(--dark-slate-blue);
  background-color: hsl(204 49% 25%);
  border-color: oklch(0.383 0.062 240.9);
}

Tailwind CSS v4

@theme {
  --color-dark-slate-blue: #214761;
  --color-dark-slate-blue-50: #e7f8ff;
  --color-dark-slate-blue-100: #d7ebfb;
  --color-dark-slate-blue-200: #bed8ed;
  --color-dark-slate-blue-300: #9dbcd5;
  --color-dark-slate-blue-400: #7ea4c0;
  --color-dark-slate-blue-500: #608cac;
  --color-dark-slate-blue-600: #527691;
  --color-dark-slate-blue-700: #415f74;
  --color-dark-slate-blue-800: #2e4656;
  --color-dark-slate-blue-900: #1f303c;
  --color-dark-slate-blue-950: #0f1c26;
}

SCSS

$dark-slate-blue: #214761;
$dark-slate-blue-rgb: 33, 71, 97;
$dark-slate-blue-light: mix(#fff, $dark-slate-blue, 20%);
$dark-slate-blue-dark: mix(#000, $dark-slate-blue, 20%);

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