#537E7F

CSS

:root {
  --submerged: #537e7f;
  --submerged-rgb: 83 126 127;
  --submerged-oklch: oklch(0.562 0.047 197.7);
}

.element {
  color: var(--submerged);
  background-color: hsl(181 21% 41%);
  border-color: oklch(0.562 0.047 197.7);
}

Tailwind CSS v4

@theme {
  --color-submerged: #537e7f;
  --color-submerged-50: #e6fafa;
  --color-submerged-100: #d7edee;
  --color-submerged-200: #bedbdc;
  --color-submerged-300: #9cbfc1;
  --color-submerged-400: #7ea7a8;
  --color-submerged-500: #609091;
  --color-submerged-600: #527a7b;
  --color-submerged-700: #416262;
  --color-submerged-800: #2e4848;
  --color-submerged-900: #1f3232;
  --color-submerged-950: #0f1e1e;
}

SCSS

$submerged: #537e7f;
$submerged-rgb: 83, 126, 127;
$submerged-light: mix(#fff, $submerged, 20%);
$submerged-dark: mix(#000, $submerged, 20%);

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