#3BA8BF

CSS

:root {
  --true-sky-blue: #3ba8bf;
  --true-sky-blue-rgb: 59 168 191;
  --true-sky-blue-oklch: oklch(0.68 0.102 214.6);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(190 53% 49%);
  border-color: oklch(0.68 0.102 214.6);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #3ba8bf;
  --color-true-sky-blue-50: #d6fdff;
  --color-true-sky-blue-100: #c2f1fe;
  --color-true-sky-blue-200: #a2e0f1;
  --color-true-sky-blue-300: #78c5d9;
  --color-true-sky-blue-400: #4aaec4;
  --color-true-sky-blue-500: #0097b0;
  --color-true-sky-blue-600: #017f94;
  --color-true-sky-blue-700: #056677;
  --color-true-sky-blue-800: #004b57;
  --color-true-sky-blue-900: #02343d;
  --color-true-sky-blue-950: #002026;
}

SCSS

$true-sky-blue: #3ba8bf;
$true-sky-blue-rgb: 59, 168, 191;
$true-sky-blue-light: mix(#fff, $true-sky-blue, 20%);
$true-sky-blue-dark: mix(#000, $true-sky-blue, 20%);

.element {
  color: $true-sky-blue;
  box-shadow: 0 0 0 2px rgba($true-sky-blue, 0.35);
}