#4D727B

CSS

:root {
  --winter-storm: #4d727b;
  --winter-storm-rgb: 77 114 123;
  --winter-storm-oklch: oklch(0.528 0.044 214.6);
}

.element {
  color: var(--winter-storm);
  background-color: hsl(192 23% 39%);
  border-color: oklch(0.528 0.044 214.6);
}

Tailwind CSS v4

@theme {
  --color-winter-storm: #4d727b;
  --color-winter-storm-50: #e8f9fd;
  --color-winter-storm-100: #d8ecf1;
  --color-winter-storm-200: #c0d9e0;
  --color-winter-storm-300: #9fbdc6;
  --color-winter-storm-400: #81a6af;
  --color-winter-storm-500: #648e98;
  --color-winter-storm-600: #557881;
  --color-winter-storm-700: #446067;
  --color-winter-storm-800: #30474b;
  --color-winter-storm-900: #213134;
  --color-winter-storm-950: #101d20;
}

SCSS

$winter-storm: #4d727b;
$winter-storm-rgb: 77, 114, 123;
$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);
}