#507B83

CSS

:root {
  --submerged: #507b83;
  --submerged-rgb: 80 123 131;
  --submerged-oklch: oklch(0.555 0.049 210.5);
}

.element {
  color: var(--submerged);
  background-color: hsl(189 24% 41%);
  border-color: oklch(0.555 0.049 210.5);
}

Tailwind CSS v4

@theme {
  --color-submerged: #507b83;
  --color-submerged-50: #e6f9fd;
  --color-submerged-100: #d6edf2;
  --color-submerged-200: #bddae1;
  --color-submerged-300: #9bbfc6;
  --color-submerged-400: #7da7af;
  --color-submerged-500: #5f8f98;
  --color-submerged-600: #517981;
  --color-submerged-700: #406167;
  --color-submerged-800: #2e474b;
  --color-submerged-900: #1f3134;
  --color-submerged-950: #0f1d20;
}

SCSS

$submerged: #507b83;
$submerged-rgb: 80, 123, 131;
$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);
}