#13A4E6

CSS

:root {
  --high-blue: #13a4e6;
  --high-blue-rgb: 19 164 230;
  --high-blue-oklch: oklch(0.681 0.145 236.9);
}

.element {
  color: var(--high-blue);
  background-color: hsl(199 85% 49%);
  border-color: oklch(0.681 0.145 236.9);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #13a4e6;
  --color-high-blue-50: #d0fcff;
  --color-high-blue-100: #bcf0ff;
  --color-high-blue-200: #99ddff;
  --color-high-blue-300: #6bc1f9;
  --color-high-blue-400: #30aae9;
  --color-high-blue-500: #0091d9;
  --color-high-blue-600: #007bb7;
  --color-high-blue-700: #006293;
  --color-high-blue-800: #00496d;
  --color-high-blue-900: #00324d;
  --color-high-blue-950: #001e33;
}

SCSS

$high-blue: #13a4e6;
$high-blue-rgb: 19, 164, 230;
$high-blue-light: mix(#fff, $high-blue, 20%);
$high-blue-dark: mix(#000, $high-blue, 20%);

.element {
  color: $high-blue;
  box-shadow: 0 0 0 2px rgba($high-blue, 0.35);
}