#5D9FE2

CSS

:root {
  --blue-bay: #5d9fe2;
  --blue-bay-rgb: 93 159 226;
  --blue-bay-oklch: oklch(0.687 0.12 250.3);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(210 70% 63%);
  border-color: oklch(0.687 0.12 250.3);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #5d9fe2;
  --color-blue-bay-50: #ddf8ff;
  --color-blue-bay-100: #ccebff;
  --color-blue-bay-200: #b0d8ff;
  --color-blue-bay-300: #8abbf4;
  --color-blue-bay-400: #65a3e3;
  --color-blue-bay-500: #408ad2;
  --color-blue-bay-600: #3775b1;
  --color-blue-bay-700: #2c5e8f;
  --color-blue-bay-800: #1c456a;
  --color-blue-bay-900: #12304a;
  --color-blue-bay-950: #041c31;
}

SCSS

$blue-bay: #5d9fe2;
$blue-bay-rgb: 93, 159, 226;
$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);
}