#719ED4

CSS

:root {
  --blue-bay: #719ed4;
  --blue-bay-rgb: 113 158 212;
  --blue-bay-oklch: oklch(0.688 0.094 253.5);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(213 54% 64%);
  border-color: oklch(0.688 0.094 253.5);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #719ed4;
  --color-blue-bay-50: #e4f7ff;
  --color-blue-bay-100: #d4eaff;
  --color-blue-bay-200: #bad7fd;
  --color-blue-bay-300: #98bae7;
  --color-blue-bay-400: #77a2d5;
  --color-blue-bay-500: #5889c3;
  --color-blue-bay-600: #4b74a5;
  --color-blue-bay-700: #3c5d84;
  --color-blue-bay-800: #294462;
  --color-blue-bay-900: #1b2f45;
  --color-blue-bay-950: #0c1c2c;
}

SCSS

$blue-bay: #719ed4;
$blue-bay-rgb: 113, 158, 212;
$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);
}