#497F86

CSS

:root {
  --submerged: #497f86;
  --submerged-rgb: 73 127 134;
  --submerged-oklch: oklch(0.562 0.058 206.3);
}

.element {
  color: var(--submerged);
  background-color: hsl(187 29% 41%);
  border-color: oklch(0.562 0.058 206.3);
}

Tailwind CSS v4

@theme {
  --color-submerged: #497f86;
  --color-submerged-50: #e3fafe;
  --color-submerged-100: #d3eef2;
  --color-submerged-200: #b8dce1;
  --color-submerged-300: #95c0c7;
  --color-submerged-400: #75a9b0;
  --color-submerged-500: #559199;
  --color-submerged-600: #487b82;
  --color-submerged-700: #3a6268;
  --color-submerged-800: #29484c;
  --color-submerged-900: #1b3235;
  --color-submerged-950: #0b1e20;
}

SCSS

$submerged: #497f86;
$submerged-rgb: 73, 127, 134;
$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);
}