#477F87

CSS

:root {
  --submerged: #477f87;
  --submerged-rgb: 71 127 135;
  --submerged-oklch: oklch(0.561 0.06 207.4);
}

.element {
  color: var(--submerged);
  background-color: hsl(188 31% 40%);
  border-color: oklch(0.561 0.06 207.4);
}

Tailwind CSS v4

@theme {
  --color-submerged: #477f87;
  --color-submerged-50: #e2faff;
  --color-submerged-100: #d2eef3;
  --color-submerged-200: #b8dce2;
  --color-submerged-300: #94c0c8;
  --color-submerged-400: #73a9b1;
  --color-submerged-500: #53929b;
  --color-submerged-600: #477b83;
  --color-submerged-700: #386369;
  --color-submerged-800: #28484c;
  --color-submerged-900: #1b3235;
  --color-submerged-950: #0b1e20;
}

SCSS

$submerged: #477f87;
$submerged-rgb: 71, 127, 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);
}