River Valley

CSS

:root {
  --river-valley: #94a5b7;
  --river-valley-rgb: 148 165 183;
  --river-valley-oklch: oklch(0.715 0.033 249.8);
}

.element {
  color: var(--river-valley);
  background-color: hsl(211 20% 65%);
  border-color: oklch(0.715 0.033 249.8);
}

Tailwind CSS v4

@theme {
  --color-river-valley: #94a5b7;
  --color-river-valley-50: #eff6fe;
  --color-river-valley-100: #e0e9f3;
  --color-river-valley-200: #cbd6e2;
  --color-river-valley-300: #acb9c8;
  --color-river-valley-400: #90a0b1;
  --color-river-valley-500: #76889b;
  --color-river-valley-600: #647383;
  --color-river-valley-700: #505c69;
  --color-river-valley-800: #3a444d;
  --color-river-valley-900: #272f36;
  --color-river-valley-950: #161b21;
}

SCSS

$river-valley: #94a5b7;
$river-valley-rgb: 148, 165, 183;
$river-valley-light: mix(#fff, $river-valley, 20%);
$river-valley-dark: mix(#000, $river-valley, 20%);

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