#517177

CSS

:root {
  --winter-storm: #517177;
  --winter-storm-rgb: 81 113 119;
  --winter-storm-oklch: oklch(0.526 0.038 210.4);
}

.element {
  color: var(--winter-storm);
  background-color: hsl(189 19% 39%);
  border-color: oklch(0.526 0.038 210.4);
}

Tailwind CSS v4

@theme {
  --color-winter-storm: #517177;
  --color-winter-storm-50: #eaf8fc;
  --color-winter-storm-100: #daecef;
  --color-winter-storm-200: #c3d9de;
  --color-winter-storm-300: #a2bdc3;
  --color-winter-storm-400: #85a5ab;
  --color-winter-storm-500: #698d94;
  --color-winter-storm-600: #59787d;
  --color-winter-storm-700: #476064;
  --color-winter-storm-800: #334649;
  --color-winter-storm-900: #233133;
  --color-winter-storm-950: #121d1f;
}

SCSS

$winter-storm: #517177;
$winter-storm-rgb: 81, 113, 119;
$winter-storm-light: mix(#fff, $winter-storm, 20%);
$winter-storm-dark: mix(#000, $winter-storm, 20%);

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