#464ED5

CSS

:root {
  --warm-blue: #464ed5;
  --warm-blue-rgb: 70 78 213;
  --warm-blue-oklch: oklch(0.503 0.203 273.8);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(237 63% 55%);
  border-color: oklch(0.503 0.203 273.8);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #464ed5;
  --color-warm-blue-50: #e4f1ff;
  --color-warm-blue-100: #d5e3ff;
  --color-warm-blue-200: #bccdff;
  --color-warm-blue-300: #9cacff;
  --color-warm-blue-400: #7b8fff;
  --color-warm-blue-500: #6170ff;
  --color-warm-blue-600: #535fe0;
  --color-warm-blue-700: #424cb4;
  --color-warm-blue-800: #2c3887;
  --color-warm-blue-900: #1d2760;
  --color-warm-blue-950: #0e1442;
}

SCSS

$warm-blue: #464ed5;
$warm-blue-rgb: 70, 78, 213;
$warm-blue-light: mix(#fff, $warm-blue, 20%);
$warm-blue-dark: mix(#000, $warm-blue, 20%);

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