#8DBEC3

CSS

:root {
  --misty-cold-sea: #8dbec3;
  --misty-cold-sea-rgb: 141 190 195;
  --misty-cold-sea-oklch: oklch(0.769 0.052 204);
}

.element {
  color: var(--misty-cold-sea);
  background-color: hsl(186 31% 66%);
  border-color: oklch(0.769 0.052 204);
}

Tailwind CSS v4

@theme {
  --color-misty-cold-sea: #8dbec3;
  --color-misty-cold-sea-50: #e5fafc;
  --color-misty-cold-sea-100: #d5edf0;
  --color-misty-cold-sea-200: #bcdbdf;
  --color-misty-cold-sea-300: #99bfc4;
  --color-misty-cold-sea-400: #7aa8ad;
  --color-misty-cold-sea-500: #5b9196;
  --color-misty-cold-sea-600: #4e7a7f;
  --color-misty-cold-sea-700: #3e6266;
  --color-misty-cold-sea-800: #2c484a;
  --color-misty-cold-sea-900: #1e3233;
  --color-misty-cold-sea-950: #0d1e1f;
}

SCSS

$misty-cold-sea: #8dbec3;
$misty-cold-sea-rgb: 141, 190, 195;
$misty-cold-sea-light: mix(#fff, $misty-cold-sea, 20%);
$misty-cold-sea-dark: mix(#000, $misty-cold-sea, 20%);

.element {
  color: $misty-cold-sea;
  box-shadow: 0 0 0 2px rgba($misty-cold-sea, 0.35);
}