#39A7C2

CSS

:root {
  --true-sky-blue: #39a7c2;
  --true-sky-blue-rgb: 57 167 194;
  --true-sky-blue-oklch: oklch(0.678 0.104 217.6);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(192 55% 49%);
  border-color: oklch(0.678 0.104 217.6);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #39a7c2;
  --color-true-sky-blue-50: #d5fdff;
  --color-true-sky-blue-100: #c2f1ff;
  --color-true-sky-blue-200: #a2dff3;
  --color-true-sky-blue-300: #77c4dc;
  --color-true-sky-blue-400: #49adc7;
  --color-true-sky-blue-500: #0096b3;
  --color-true-sky-blue-600: #007f98;
  --color-true-sky-blue-700: #03667a;
  --color-true-sky-blue-800: #004b59;
  --color-true-sky-blue-900: #02343e;
  --color-true-sky-blue-950: #001f27;
}

SCSS

$true-sky-blue: #39a7c2;
$true-sky-blue-rgb: 57, 167, 194;
$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);
}