#39A3E0

CSS

:root {
  --high-blue: #39a3e0;
  --high-blue-rgb: 57 163 224;
  --high-blue-oklch: oklch(0.682 0.13 238.6);
}

.element {
  color: var(--high-blue);
  background-color: hsl(202 73% 55%);
  border-color: oklch(0.682 0.13 238.6);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #39a3e0;
  --color-high-blue-50: #d5fbff;
  --color-high-blue-100: #c1eeff;
  --color-high-blue-200: #a1dcff;
  --color-high-blue-300: #77c0f4;
  --color-high-blue-400: #48a8e2;
  --color-high-blue-500: #0090d2;
  --color-high-blue-600: #007ab1;
  --color-high-blue-700: #02618e;
  --color-high-blue-800: #004869;
  --color-high-blue-900: #00324a;
  --color-high-blue-950: #001e31;
}

SCSS

$high-blue: #39a3e0;
$high-blue-rgb: 57, 163, 224;
$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);
}