#45A3DA

CSS

:root {
  --high-blue: #45a3da;
  --high-blue-rgb: 69 163 218;
  --high-blue-oklch: oklch(0.683 0.12 237.9);
}

.element {
  color: var(--high-blue);
  background-color: hsl(202 67% 56%);
  border-color: oklch(0.683 0.12 237.9);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #45a3da;
  --color-high-blue-50: #d7fbff;
  --color-high-blue-100: #c5eeff;
  --color-high-blue-200: #a6dcff;
  --color-high-blue-300: #7dc0ef;
  --color-high-blue-400: #51a8dd;
  --color-high-blue-500: #1790cb;
  --color-high-blue-600: #197aac;
  --color-high-blue-700: #15618a;
  --color-high-blue-800: #084866;
  --color-high-blue-900: #063248;
  --color-high-blue-950: #001e2f;
}

SCSS

$high-blue: #45a3da;
$high-blue-rgb: 69, 163, 218;
$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);
}