#527E82

CSS

:root {
  --submerged: #527e82;
  --submerged-rgb: 82 126 130;
  --submerged-oklch: oklch(0.563 0.049 203.1);
}

.element {
  color: var(--submerged);
  background-color: hsl(185 23% 42%);
  border-color: oklch(0.563 0.049 203.1);
}

Tailwind CSS v4

@theme {
  --color-submerged: #527e82;
  --color-submerged-50: #e6fafc;
  --color-submerged-100: #d6edf0;
  --color-submerged-200: #bddbde;
  --color-submerged-300: #9bbfc3;
  --color-submerged-400: #7da7ab;
  --color-submerged-500: #5e9095;
  --color-submerged-600: #507a7e;
  --color-submerged-700: #406265;
  --color-submerged-800: #2e4849;
  --color-submerged-900: #1f3233;
  --color-submerged-950: #0e1e1f;
}

SCSS

$submerged: #527e82;
$submerged-rgb: 82, 126, 130;
$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);
}