#497E87

CSS

:root {
  --submerged: #497e87;
  --submerged-rgb: 73 126 135;
  --submerged-oklch: oklch(0.56 0.058 209.5);
}

.element {
  color: var(--submerged);
  background-color: hsl(189 30% 41%);
  border-color: oklch(0.56 0.058 209.5);
}

Tailwind CSS v4

@theme {
  --color-submerged: #497e87;
  --color-submerged-50: #e3faff;
  --color-submerged-100: #d3eef3;
  --color-submerged-200: #b9dbe3;
  --color-submerged-300: #96c0c9;
  --color-submerged-400: #76a8b1;
  --color-submerged-500: #55919b;
  --color-submerged-600: #497b83;
  --color-submerged-700: #3a6269;
  --color-submerged-800: #29484d;
  --color-submerged-900: #1b3235;
  --color-submerged-950: #0b1e20;
}

SCSS

$submerged: #497e87;
$submerged-rgb: 73, 126, 135;
$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);
}