#527B82

CSS

:root {
  --submerged: #527b82;
  --submerged-rgb: 82 123 130;
  --submerged-oklch: oklch(0.555 0.047 209.3);
}

.element {
  color: var(--submerged);
  background-color: hsl(189 23% 42%);
  border-color: oklch(0.555 0.047 209.3);
}

Tailwind CSS v4

@theme {
  --color-submerged: #527b82;
  --color-submerged-50: #e7f9fd;
  --color-submerged-100: #d7ecf1;
  --color-submerged-200: #bedae0;
  --color-submerged-300: #9dbec5;
  --color-submerged-400: #7fa7ad;
  --color-submerged-500: #618f97;
  --color-submerged-600: #527980;
  --color-submerged-700: #426166;
  --color-submerged-800: #2f474b;
  --color-submerged-900: #203134;
  --color-submerged-950: #0f1d1f;
}

SCSS

$submerged: #527b82;
$submerged-rgb: 82, 123, 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);
}