#4DA6BF

CSS

:root {
  --true-sky-blue: #4da6bf;
  --true-sky-blue-rgb: 77 166 191;
  --true-sky-blue-oklch: oklch(0.681 0.092 219);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(193 47% 53%);
  border-color: oklch(0.681 0.092 219);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #4da6bf;
  --color-true-sky-blue-50: #d9fcff;
  --color-true-sky-blue-100: #c7f0fe;
  --color-true-sky-blue-200: #a9def0;
  --color-true-sky-blue-300: #81c3d9;
  --color-true-sky-blue-400: #59acc3;
  --color-true-sky-blue-500: #2894af;
  --color-true-sky-blue-600: #257d94;
  --color-true-sky-blue-700: #1e6477;
  --color-true-sky-blue-800: #124a57;
  --color-true-sky-blue-900: #0c333d;
  --color-true-sky-blue-950: #001f26;
}

SCSS

$true-sky-blue: #4da6bf;
$true-sky-blue-rgb: 77, 166, 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);
}