#557079

CSS

:root {
  --winter-storm: #557079;
  --winter-storm-rgb: 85 112 121;
  --winter-storm-oklch: oklch(0.527 0.035 220.3);
}

.element {
  color: var(--winter-storm);
  background-color: hsl(195 17% 40%);
  border-color: oklch(0.527 0.035 220.3);
}

Tailwind CSS v4

@theme {
  --color-winter-storm: #557079;
  --color-winter-storm-50: #ebf8fc;
  --color-winter-storm-100: #dcebf0;
  --color-winter-storm-200: #c5d8df;
  --color-winter-storm-300: #a5bcc4;
  --color-winter-storm-400: #89a4ad;
  --color-winter-storm-500: #6d8c96;
  --color-winter-storm-600: #5d767f;
  --color-winter-storm-700: #4a5f66;
  --color-winter-storm-800: #35454a;
  --color-winter-storm-900: #243034;
  --color-winter-storm-950: #131c1f;
}

SCSS

$winter-storm: #557079;
$winter-storm-rgb: 85, 112, 121;
$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);
}