#579EDF

CSS

:root {
  --blue-bay: #579edf;
  --blue-bay-rgb: 87 158 223;
  --blue-bay-oklch: oklch(0.681 0.12 248.1);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(209 68% 61%);
  border-color: oklch(0.681 0.12 248.1);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #579edf;
  --color-blue-bay-50: #dcf9ff;
  --color-blue-bay-100: #caecff;
  --color-blue-bay-200: #aed9ff;
  --color-blue-bay-300: #88bcf3;
  --color-blue-bay-400: #61a4e2;
  --color-blue-bay-500: #3a8bd1;
  --color-blue-bay-600: #3376b1;
  --color-blue-bay-700: #285e8e;
  --color-blue-bay-800: #194669;
  --color-blue-bay-900: #10304a;
  --color-blue-bay-950: #031c31;
}

SCSS

$blue-bay: #579edf;
$blue-bay-rgb: 87, 158, 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);
}