#4DA3D8

CSS

:root {
  --high-blue: #4da3d8;
  --high-blue-rgb: 77 163 216;
  --high-blue-oklch: oklch(0.685 0.114 238.6);
}

.element {
  color: var(--high-blue);
  background-color: hsl(203 64% 57%);
  border-color: oklch(0.685 0.114 238.6);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #4da3d8;
  --color-high-blue-50: #d9faff;
  --color-high-blue-100: #c7eeff;
  --color-high-blue-200: #a9dbff;
  --color-high-blue-300: #81bfec;
  --color-high-blue-400: #57a8da;
  --color-high-blue-500: #278fc9;
  --color-high-blue-600: #2479a9;
  --color-high-blue-700: #1d6188;
  --color-high-blue-800: #104864;
  --color-high-blue-900: #0a3247;
  --color-high-blue-950: #001d2e;
}

SCSS

$high-blue: #4da3d8;
$high-blue-rgb: 77, 163, 216;
$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);
}