#1FA4E8

CSS

:root {
  --high-blue: #1fa4e8;
  --high-blue-rgb: 31 164 232;
  --high-blue-oklch: oklch(0.684 0.145 238.4);
}

.element {
  color: var(--high-blue);
  background-color: hsl(200 81% 52%);
  border-color: oklch(0.684 0.145 238.4);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #1fa4e8;
  --color-high-blue-50: #d1fcff;
  --color-high-blue-100: #bdefff;
  --color-high-blue-200: #9bddff;
  --color-high-blue-300: #6dc1fa;
  --color-high-blue-400: #35a9ea;
  --color-high-blue-500: #0090da;
  --color-high-blue-600: #007ab8;
  --color-high-blue-700: #006294;
  --color-high-blue-800: #00486d;
  --color-high-blue-900: #00324d;
  --color-high-blue-950: #001e33;
}

SCSS

$high-blue: #1fa4e8;
$high-blue-rgb: 31, 164, 232;
$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);
}