#45A7BE

CSS

:root {
  --true-sky-blue: #45a7be;
  --true-sky-blue-rgb: 69 167 190;
  --true-sky-blue-oklch: oklch(0.68 0.096 215.9);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(191 48% 51%);
  border-color: oklch(0.68 0.096 215.9);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #45a7be;
  --color-true-sky-blue-50: #d8fdff;
  --color-true-sky-blue-100: #c5f0fd;
  --color-true-sky-blue-200: #a6dff0;
  --color-true-sky-blue-300: #7dc4d8;
  --color-true-sky-blue-400: #52adc3;
  --color-true-sky-blue-500: #1795af;
  --color-true-sky-blue-600: #197e93;
  --color-true-sky-blue-700: #156576;
  --color-true-sky-blue-800: #0b4b57;
  --color-true-sky-blue-900: #07343c;
  --color-true-sky-blue-950: #001f26;
}

SCSS

$true-sky-blue: #45a7be;
$true-sky-blue-rgb: 69, 167, 190;
$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);
}