#003BC3

CSS

:root {
  --blue-screen-of-death: #003bc3;
  --blue-screen-of-death-rgb: 0 59 195;
  --blue-screen-of-death-oklch: oklch(0.429 0.216 263);
}

.element {
  color: var(--blue-screen-of-death);
  background-color: hsl(222 100% 38%);
  border-color: oklch(0.429 0.216 263);
}

Tailwind CSS v4

@theme {
  --color-blue-screen-of-death: #003bc3;
  --color-blue-screen-of-death-50: #d7f5ff;
  --color-blue-screen-of-death-100: #c5e7ff;
  --color-blue-screen-of-death-200: #a7d2ff;
  --color-blue-screen-of-death-300: #80b2ff;
  --color-blue-screen-of-death-400: #5796ff;
  --color-blue-screen-of-death-500: #3277ff;
  --color-blue-screen-of-death-600: #2b66e7;
  --color-blue-screen-of-death-700: #2251ba;
  --color-blue-screen-of-death-800: #0f3c8b;
  --color-blue-screen-of-death-900: #092a63;
  --color-blue-screen-of-death-950: #011644;
}

SCSS

$blue-screen-of-death: #003bc3;
$blue-screen-of-death-rgb: 0, 59, 195;
$blue-screen-of-death-light: mix(#fff, $blue-screen-of-death, 20%);
$blue-screen-of-death-dark: mix(#000, $blue-screen-of-death, 20%);

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