#527B83

CSS

:root {
  --submerged: #527b83;
  --submerged-rgb: 82 123 131;
  --submerged-oklch: oklch(0.556 0.047 211.1);
}

.element {
  color: var(--submerged);
  background-color: hsl(190 23% 42%);
  border-color: oklch(0.556 0.047 211.1);
}

Tailwind CSS v4

@theme {
  --color-submerged: #527b83;
  --color-submerged-50: #e7f9fd;
  --color-submerged-100: #d7ecf1;
  --color-submerged-200: #bedae0;
  --color-submerged-300: #9dbec6;
  --color-submerged-400: #7ea6ae;
  --color-submerged-500: #618f98;
  --color-submerged-600: #527981;
  --color-submerged-700: #426167;
  --color-submerged-800: #2f474b;
  --color-submerged-900: #203134;
  --color-submerged-950: #0f1d20;
}

SCSS

$submerged: #527b83;
$submerged-rgb: 82, 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);
}