#43A3DE

CSS

:root {
  --high-blue: #43a3de;
  --high-blue-rgb: 67 163 222;
  --high-blue-oklch: oklch(0.684 0.125 239.4);
}

.element {
  color: var(--high-blue);
  background-color: hsl(203 70% 57%);
  border-color: oklch(0.684 0.125 239.4);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #43a3de;
  --color-high-blue-50: #d7fbff;
  --color-high-blue-100: #c4eeff;
  --color-high-blue-200: #a5dcff;
  --color-high-blue-300: #7bc0f2;
  --color-high-blue-400: #4fa8e0;
  --color-high-blue-500: #108fcf;
  --color-high-blue-600: #1579af;
  --color-high-blue-700: #12618c;
  --color-high-blue-800: #054868;
  --color-high-blue-900: #043249;
  --color-high-blue-950: #001d30;
}

SCSS

$high-blue: #43a3de;
$high-blue-rgb: 67, 163, 222;
$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);
}