#0EA4EB

CSS

:root {
  --high-blue: #0ea4eb;
  --high-blue-rgb: 14 164 235;
  --high-blue-oklch: oklch(0.683 0.151 238.6);
}

.element {
  color: var(--high-blue);
  background-color: hsl(199 89% 49%);
  border-color: oklch(0.683 0.151 238.6);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #0ea4eb;
  --color-high-blue-50: #cffcff;
  --color-high-blue-100: #bbefff;
  --color-high-blue-200: #98ddff;
  --color-high-blue-300: #6ac1fd;
  --color-high-blue-400: #2da9ed;
  --color-high-blue-500: #0090dd;
  --color-high-blue-600: #007abb;
  --color-high-blue-700: #006296;
  --color-high-blue-800: #00486f;
  --color-high-blue-900: #00324e;
  --color-high-blue-950: #001e34;
}

SCSS

$high-blue: #0ea4eb;
$high-blue-rgb: 14, 164, 235;
$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);
}