#497AAB

CSS

:root {
  --into-the-blue: #497aab;
  --into-the-blue-rgb: 73 122 171;
  --into-the-blue-oklch: oklch(0.566 0.093 249.8);
}

.element {
  color: var(--into-the-blue);
  background-color: hsl(210 40% 48%);
  border-color: oklch(0.566 0.093 249.8);
}

Tailwind CSS v4

@theme {
  --color-into-the-blue: #497aab;
  --color-into-the-blue-50: #e2f8ff;
  --color-into-the-blue-100: #d2ebff;
  --color-into-the-blue-200: #b8d8fc;
  --color-into-the-blue-300: #95bbe6;
  --color-into-the-blue-400: #73a3d4;
  --color-into-the-blue-500: #538ac1;
  --color-into-the-blue-600: #4775a3;
  --color-into-the-blue-700: #395e83;
  --color-into-the-blue-800: #264561;
  --color-into-the-blue-900: #1a3044;
  --color-into-the-blue-950: #0a1c2c;
}

SCSS

$into-the-blue: #497aab;
$into-the-blue-rgb: 73, 122, 171;
$into-the-blue-light: mix(#fff, $into-the-blue, 20%);
$into-the-blue-dark: mix(#000, $into-the-blue, 20%);

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