#619FDD

CSS

:root {
  --blue-bay: #619fdd;
  --blue-bay-rgb: 97 159 221;
  --blue-bay-oklch: oklch(0.686 0.112 249.8);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(210 65% 62%);
  border-color: oklch(0.686 0.112 249.8);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #619fdd;
  --color-blue-bay-50: #dff8ff;
  --color-blue-bay-100: #cdebff;
  --color-blue-bay-200: #b2d8ff;
  --color-blue-bay-300: #8dbcf0;
  --color-blue-bay-400: #69a3de;
  --color-blue-bay-500: #458acd;
  --color-blue-bay-600: #3c75ad;
  --color-blue-bay-700: #2f5e8b;
  --color-blue-bay-800: #1f4567;
  --color-blue-bay-900: #143048;
  --color-blue-bay-950: #061c2f;
}

SCSS

$blue-bay: #619fdd;
$blue-bay-rgb: 97, 159, 221;
$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);
}