#1271E4

CSS

:root {
  --deep-sky-blue: #1271e4;
  --deep-sky-blue-rgb: 18 113 228;
  --deep-sky-blue-oklch: oklch(0.565 0.193 257.2);
}

.element {
  color: var(--deep-sky-blue);
  background-color: hsl(213 85% 48%);
  border-color: oklch(0.565 0.193 257.2);
}

Tailwind CSS v4

@theme {
  --color-deep-sky-blue: #1271e4;
  --color-deep-sky-blue-50: #d5f7ff;
  --color-deep-sky-blue-100: #c2eaff;
  --color-deep-sky-blue-200: #a2d6ff;
  --color-deep-sky-blue-300: #79b7ff;
  --color-deep-sky-blue-400: #4c9dff;
  --color-deep-sky-blue-500: #1580ff;
  --color-deep-sky-blue-600: #166dd9;
  --color-deep-sky-blue-700: #1257af;
  --color-deep-sky-blue-800: #014183;
  --color-deep-sky-blue-900: #022d5c;
  --color-deep-sky-blue-950: #00193f;
}

SCSS

$deep-sky-blue: #1271e4;
$deep-sky-blue-rgb: 18, 113, 228;
$deep-sky-blue-light: mix(#fff, $deep-sky-blue, 20%);
$deep-sky-blue-dark: mix(#000, $deep-sky-blue, 20%);

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