#29A8C5

CSS

:root {
  --true-sky-blue: #29a8c5;
  --true-sky-blue-rgb: 41 168 197;
  --true-sky-blue-oklch: oklch(0.678 0.112 217.5);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(191 66% 47%);
  border-color: oklch(0.678 0.112 217.5);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #29a8c5;
  --color-true-sky-blue-50: #d3feff;
  --color-true-sky-blue-100: #bff2ff;
  --color-true-sky-blue-200: #9ee0f5;
  --color-true-sky-blue-300: #71c5df;
  --color-true-sky-blue-400: #3eaeca;
  --color-true-sky-blue-500: #0097b7;
  --color-true-sky-blue-600: #00809a;
  --color-true-sky-blue-700: #00667c;
  --color-true-sky-blue-800: #004c5b;
  --color-true-sky-blue-900: #00343f;
  --color-true-sky-blue-950: #002028;
}

SCSS

$true-sky-blue: #29a8c5;
$true-sky-blue-rgb: 41, 168, 197;
$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);
}