#4DA2D9

CSS

:root {
  --high-blue: #4da2d9;
  --high-blue-rgb: 77 162 217;
  --high-blue-oklch: oklch(0.683 0.116 239.9);
}

.element {
  color: var(--high-blue);
  background-color: hsl(204 65% 58%);
  border-color: oklch(0.683 0.116 239.9);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #4da2d9;
  --color-high-blue-50: #d9faff;
  --color-high-blue-100: #c7eeff;
  --color-high-blue-200: #a9dbff;
  --color-high-blue-300: #81bfee;
  --color-high-blue-400: #58a7dc;
  --color-high-blue-500: #288fca;
  --color-high-blue-600: #2579ab;
  --color-high-blue-700: #1e6189;
  --color-high-blue-800: #104765;
  --color-high-blue-900: #0a3147;
  --color-high-blue-950: #001d2e;
}

SCSS

$high-blue: #4da2d9;
$high-blue-rgb: 77, 162, 217;
$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);
}