#589EE9

CSS

:root {
  --blue-bay: #589ee9;
  --blue-bay-rgb: 88 158 233;
  --blue-bay-oklch: oklch(0.686 0.132 251.7);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(211 77% 63%);
  border-color: oklch(0.686 0.132 251.7);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #589ee9;
  --color-blue-bay-50: #dcf8ff;
  --color-blue-bay-100: #caebff;
  --color-blue-bay-200: #add8ff;
  --color-blue-bay-300: #87bbfa;
  --color-blue-bay-400: #60a2ea;
  --color-blue-bay-500: #3989da;
  --color-blue-bay-600: #3274b8;
  --color-blue-bay-700: #285d94;
  --color-blue-bay-800: #18446e;
  --color-blue-bay-900: #0f2f4d;
  --color-blue-bay-950: #031c33;
}

SCSS

$blue-bay: #589ee9;
$blue-bay-rgb: 88, 158, 233;
$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);
}