#4E7C84

CSS

:root {
  --submerged: #4e7c84;
  --submerged-rgb: 78 124 132;
  --submerged-oklch: oklch(0.556 0.052 209.6);
}

.element {
  color: var(--submerged);
  background-color: hsl(189 26% 41%);
  border-color: oklch(0.556 0.052 209.6);
}

Tailwind CSS v4

@theme {
  --color-submerged: #4e7c84;
  --color-submerged-50: #e5f9fe;
  --color-submerged-100: #d5edf2;
  --color-submerged-200: #bcdbe1;
  --color-submerged-300: #9abfc7;
  --color-submerged-400: #7ba7af;
  --color-submerged-500: #5c9099;
  --color-submerged-600: #4e7a81;
  --color-submerged-700: #3e6168;
  --color-submerged-800: #2c484c;
  --color-submerged-900: #1e3235;
  --color-submerged-950: #0e1e20;
}

SCSS

$submerged: #4e7c84;
$submerged-rgb: 78, 124, 132;
$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);
}