#45A7BC

CSS

:root {
  --true-sky-blue: #45a7bc;
  --true-sky-blue-rgb: 69 167 188;
  --true-sky-blue-oklch: oklch(0.679 0.095 214.3);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(191 47% 50%);
  border-color: oklch(0.679 0.095 214.3);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #45a7bc;
  --color-true-sky-blue-50: #d8fdff;
  --color-true-sky-blue-100: #c5f1fc;
  --color-true-sky-blue-200: #a6dfef;
  --color-true-sky-blue-300: #7dc4d7;
  --color-true-sky-blue-400: #53adc1;
  --color-true-sky-blue-500: #1896ad;
  --color-true-sky-blue-600: #1a7f92;
  --color-true-sky-blue-700: #156575;
  --color-true-sky-blue-800: #0b4b56;
  --color-true-sky-blue-900: #07343c;
  --color-true-sky-blue-950: #001f26;
}

SCSS

$true-sky-blue: #45a7bc;
$true-sky-blue-rgb: 69, 167, 188;
$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);
}