#2B9CD4

CSS

:root {
  --blue-burst: #2b9cd4;
  --blue-burst-rgb: 43 156 212;
  --blue-burst-oklch: oklch(0.657 0.127 235.8);
}

.element {
  color: var(--blue-burst);
  background-color: hsl(200 66% 50%);
  border-color: oklch(0.657 0.127 235.8);
}

Tailwind CSS v4

@theme {
  --color-blue-burst: #2b9cd4;
  --color-blue-burst-50: #d4fbff;
  --color-blue-burst-100: #c1efff;
  --color-blue-burst-200: #a0ddff;
  --color-blue-burst-300: #75c1f1;
  --color-blue-burst-400: #45a9df;
  --color-blue-burst-500: #0091ce;
  --color-blue-burst-600: #007bae;
  --color-blue-burst-700: #00628c;
  --color-blue-burst-800: #004967;
  --color-blue-burst-900: #003249;
  --color-blue-burst-950: #001e30;
}

SCSS

$blue-burst: #2b9cd4;
$blue-burst-rgb: 43, 156, 212;
$blue-burst-light: mix(#fff, $blue-burst, 20%);
$blue-burst-dark: mix(#000, $blue-burst, 20%);

.element {
  color: $blue-burst;
  box-shadow: 0 0 0 2px rgba($blue-burst, 0.35);
}