#4EA2DA

CSS

:root {
  --high-blue: #4ea2da;
  --high-blue-rgb: 78 162 218;
  --high-blue-oklch: oklch(0.684 0.116 240.6);
}

.element {
  color: var(--high-blue);
  background-color: hsl(204 65% 58%);
  border-color: oklch(0.684 0.116 240.6);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #4ea2da;
  --color-high-blue-50: #d9faff;
  --color-high-blue-100: #c7edff;
  --color-high-blue-200: #a9dbff;
  --color-high-blue-300: #81bfee;
  --color-high-blue-400: #59a7dc;
  --color-high-blue-500: #2a8ecb;
  --color-high-blue-600: #2679ab;
  --color-high-blue-700: #1e618a;
  --color-high-blue-800: #114766;
  --color-high-blue-900: #0b3147;
  --color-high-blue-950: #001d2f;
}

SCSS

$high-blue: #4ea2da;
$high-blue-rgb: 78, 162, 218;
$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);
}