#2FA3E9

CSS

:root {
  --high-blue: #2fa3e9;
  --high-blue-rgb: 47 163 233;
  --high-blue-oklch: oklch(0.685 0.143 240.9);
}

.element {
  color: var(--high-blue);
  background-color: hsl(203 81% 55%);
  border-color: oklch(0.685 0.143 240.9);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #2fa3e9;
  --color-high-blue-50: #d3fbff;
  --color-high-blue-100: #bfeeff;
  --color-high-blue-200: #9edcff;
  --color-high-blue-300: #72c0fb;
  --color-high-blue-400: #3fa8ea;
  --color-high-blue-500: #008fdb;
  --color-high-blue-600: #0079b9;
  --color-high-blue-700: #006194;
  --color-high-blue-800: #00486e;
  --color-high-blue-900: #00324d;
  --color-high-blue-950: #001d33;
}

SCSS

$high-blue: #2fa3e9;
$high-blue-rgb: 47, 163, 233;
$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);
}