#619FDF

CSS

:root {
  --blue-bay: #619fdf;
  --blue-bay-rgb: 97 159 223;
  --blue-bay-oklch: oklch(0.687 0.115 250.5);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(210 66% 63%);
  border-color: oklch(0.687 0.115 250.5);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #619fdf;
  --color-blue-bay-50: #def8ff;
  --color-blue-bay-100: #cdebff;
  --color-blue-bay-200: #b2d8ff;
  --color-blue-bay-300: #8dbbf1;
  --color-blue-bay-400: #68a3e0;
  --color-blue-bay-500: #458acf;
  --color-blue-bay-600: #3b75af;
  --color-blue-bay-700: #2f5e8c;
  --color-blue-bay-800: #1e4568;
  --color-blue-bay-900: #143049;
  --color-blue-bay-950: #061c30;
}

SCSS

$blue-bay: #619fdf;
$blue-bay-rgb: 97, 159, 223;
$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);
}