#B9D1CF

CSS

:root {
  --coast-to-coast: #b9d1cf;
  --coast-to-coast-rgb: 185 209 207;
  --coast-to-coast-oklch: oklch(0.842 0.026 190.6);
}

.element {
  color: var(--coast-to-coast);
  background-color: hsl(175 21% 77%);
  border-color: oklch(0.842 0.026 190.6);
}

Tailwind CSS v4

@theme {
  --color-coast-to-coast: #b9d1cf;
  --color-coast-to-coast-50: #edf8f7;
  --color-coast-to-coast-100: #dfebea;
  --color-coast-to-coast-200: #c8d8d7;
  --color-coast-to-coast-300: #a9bcbb;
  --color-coast-to-coast-400: #8ea4a2;
  --color-coast-to-coast-500: #738c8a;
  --color-coast-to-coast-600: #627675;
  --color-coast-to-coast-700: #4e5f5d;
  --color-coast-to-coast-800: #384544;
  --color-coast-to-coast-900: #27302f;
  --color-coast-to-coast-950: #151c1c;
}

SCSS

$coast-to-coast: #b9d1cf;
$coast-to-coast-rgb: 185, 209, 207;
$coast-to-coast-light: mix(#fff, $coast-to-coast, 20%);
$coast-to-coast-dark: mix(#000, $coast-to-coast, 20%);

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