#4E7E84

CSS

:root {
  --submerged: #4e7e84;
  --submerged-rgb: 78 126 132;
  --submerged-oklch: oklch(0.561 0.053 205.9);
}

.element {
  color: var(--submerged);
  background-color: hsl(187 26% 41%);
  border-color: oklch(0.561 0.053 205.9);
}

Tailwind CSS v4

@theme {
  --color-submerged: #4e7e84;
  --color-submerged-50: #e5fafd;
  --color-submerged-100: #d5edf1;
  --color-submerged-200: #bbdbe0;
  --color-submerged-300: #99bfc5;
  --color-submerged-400: #7aa8ae;
  --color-submerged-500: #5a9197;
  --color-submerged-600: #4d7a80;
  --color-submerged-700: #3d6266;
  --color-submerged-800: #2c484b;
  --color-submerged-900: #1d3234;
  --color-submerged-950: #0d1e1f;
}

SCSS

$submerged: #4e7e84;
$submerged-rgb: 78, 126, 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);
}