#40A3DB

CSS

:root {
  --high-blue: #40a3db;
  --high-blue-rgb: 64 163 219;
  --high-blue-oklch: oklch(0.682 0.123 237.4);
}

.element {
  color: var(--high-blue);
  background-color: hsl(202 68% 55%);
  border-color: oklch(0.682 0.123 237.4);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #40a3db;
  --color-high-blue-50: #d6fbff;
  --color-high-blue-100: #c3eeff;
  --color-high-blue-200: #a4dcff;
  --color-high-blue-300: #7ac0f0;
  --color-high-blue-400: #4da8de;
  --color-high-blue-500: #0790cd;
  --color-high-blue-600: #107aad;
  --color-high-blue-700: #0e628b;
  --color-high-blue-800: #034867;
  --color-high-blue-900: #033248;
  --color-high-blue-950: #001e2f;
}

SCSS

$high-blue: #40a3db;
$high-blue-rgb: 64, 163, 219;
$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);
}