#3CA2E4

CSS

:root {
  --high-blue: #3ca2e4;
  --high-blue-rgb: 60 162 228;
  --high-blue-oklch: oklch(0.683 0.134 241.4);
}

.element {
  color: var(--high-blue);
  background-color: hsl(204 76% 56%);
  border-color: oklch(0.683 0.134 241.4);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #3ca2e4;
  --color-high-blue-50: #d5fbff;
  --color-high-blue-100: #c2eeff;
  --color-high-blue-200: #a2dbff;
  --color-high-blue-300: #78bff7;
  --color-high-blue-400: #4aa7e6;
  --color-high-blue-500: #008ed6;
  --color-high-blue-600: #0579b5;
  --color-high-blue-700: #086191;
  --color-high-blue-800: #00476b;
  --color-high-blue-900: #01314c;
  --color-high-blue-950: #001d32;
}

SCSS

$high-blue: #3ca2e4;
$high-blue-rgb: 60, 162, 228;
$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);
}