#486072

CSS

:root {
  --seven-seas: #486072;
  --seven-seas-rgb: 72 96 114;
  --seven-seas-oklch: oklch(0.477 0.041 241.1);
}

.element {
  color: var(--seven-seas);
  background-color: hsl(206 23% 36%);
  border-color: oklch(0.477 0.041 241.1);
}

Tailwind CSS v4

@theme {
  --color-seven-seas: #486072;
  --color-seven-seas-50: #ecf7ff;
  --color-seven-seas-100: #ddeaf5;
  --color-seven-seas-200: #c6d7e5;
  --color-seven-seas-300: #a6bacb;
  --color-seven-seas-400: #8aa2b5;
  --color-seven-seas-500: #6e8a9f;
  --color-seven-seas-600: #5e7587;
  --color-seven-seas-700: #4b5e6c;
  --color-seven-seas-800: #35454f;
  --color-seven-seas-900: #242f37;
  --color-seven-seas-950: #131c22;
}

SCSS

$seven-seas: #486072;
$seven-seas-rgb: 72, 96, 114;
$seven-seas-light: mix(#fff, $seven-seas, 20%);
$seven-seas-dark: mix(#000, $seven-seas, 20%);

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