#609FDB

CSS

:root {
  --blue-bay: #609fdb;
  --blue-bay-rgb: 96 159 219;
  --blue-bay-oklch: oklch(0.685 0.11 248.6);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(209 63% 62%);
  border-color: oklch(0.685 0.11 248.6);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #609fdb;
  --color-blue-bay-50: #def8ff;
  --color-blue-bay-100: #cdebff;
  --color-blue-bay-200: #b1d8ff;
  --color-blue-bay-300: #8dbcee;
  --color-blue-bay-400: #68a4dd;
  --color-blue-bay-500: #448bcc;
  --color-blue-bay-600: #3b76ac;
  --color-blue-bay-700: #2f5e8a;
  --color-blue-bay-800: #1e4566;
  --color-blue-bay-900: #143048;
  --color-blue-bay-950: #051c2f;
}

SCSS

$blue-bay: #609fdb;
$blue-bay-rgb: 96, 159, 219;
$blue-bay-light: mix(#fff, $blue-bay, 20%);
$blue-bay-dark: mix(#000, $blue-bay, 20%);

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