#4BA6BF

CSS

:root {
  --true-sky-blue: #4ba6bf;
  --true-sky-blue-rgb: 75 166 191;
  --true-sky-blue-oklch: oklch(0.68 0.093 218.7);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(193 48% 52%);
  border-color: oklch(0.68 0.093 218.7);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #4ba6bf;
  --color-true-sky-blue-50: #d9fcff;
  --color-true-sky-blue-100: #c7f0fe;
  --color-true-sky-blue-200: #a8def0;
  --color-true-sky-blue-300: #80c3d9;
  --color-true-sky-blue-400: #57acc4;
  --color-true-sky-blue-500: #2594b0;
  --color-true-sky-blue-600: #237e94;
  --color-true-sky-blue-700: #1c6577;
  --color-true-sky-blue-800: #104a57;
  --color-true-sky-blue-900: #0b333d;
  --color-true-sky-blue-950: #001f26;
}

SCSS

$true-sky-blue: #4ba6bf;
$true-sky-blue-rgb: 75, 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);
}