#3FA2E6

CSS

:root {
  --high-blue: #3fa2e6;
  --high-blue-rgb: 63 162 230;
  --high-blue-oklch: oklch(0.685 0.135 242.7);
}

.element {
  color: var(--high-blue);
  background-color: hsl(204 77% 57%);
  border-color: oklch(0.685 0.135 242.7);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #3fa2e6;
  --color-high-blue-50: #d6faff;
  --color-high-blue-100: #c3eeff;
  --color-high-blue-200: #a3dbff;
  --color-high-blue-300: #79bff8;
  --color-high-blue-400: #4ba7e7;
  --color-high-blue-500: #008ed7;
  --color-high-blue-600: #0c78b6;
  --color-high-blue-700: #0c6092;
  --color-high-blue-800: #00476c;
  --color-high-blue-900: #02314c;
  --color-high-blue-950: #001d32;
}

SCSS

$high-blue: #3fa2e6;
$high-blue-rgb: 63, 162, 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);
}