#02A4E9

CSS

:root {
  --high-blue: #02a4e9;
  --high-blue-rgb: 2 164 233;
  --high-blue-oklch: oklch(0.682 0.15 237.5);
}

.element {
  color: var(--high-blue);
  background-color: hsl(198 98% 46%);
  border-color: oklch(0.682 0.15 237.5);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #02a4e9;
  --color-high-blue-50: #cffcff;
  --color-high-blue-100: #bbf0ff;
  --color-high-blue-200: #97ddff;
  --color-high-blue-300: #68c1fc;
  --color-high-blue-400: #2aaaeb;
  --color-high-blue-500: #0091dc;
  --color-high-blue-600: #007bb9;
  --color-high-blue-700: #006295;
  --color-high-blue-800: #00496e;
  --color-high-blue-900: #00324e;
  --color-high-blue-950: #001e34;
}

SCSS

$high-blue: #02a4e9;
$high-blue-rgb: 2, 164, 233;
$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);
}