#3FA2E5

CSS

:root {
  --high-blue: #3fa2e5;
  --high-blue-rgb: 63 162 229;
  --high-blue-oklch: oklch(0.684 0.134 242.3);
}

.element {
  color: var(--high-blue);
  background-color: hsl(204 76% 57%);
  border-color: oklch(0.684 0.134 242.3);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #3fa2e5;
  --color-high-blue-50: #d6faff;
  --color-high-blue-100: #c3eeff;
  --color-high-blue-200: #a3dbff;
  --color-high-blue-300: #79bff7;
  --color-high-blue-400: #4ca7e7;
  --color-high-blue-500: #018ed7;
  --color-high-blue-600: #0d78b5;
  --color-high-blue-700: #0c6091;
  --color-high-blue-800: #00476c;
  --color-high-blue-900: #02314c;
  --color-high-blue-950: #001d32;
}

SCSS

$high-blue: #3fa2e5;
$high-blue-rgb: 63, 162, 229;
$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);
}