#2E5FA3

CSS

:root {
  --blue-chip: #2e5fa3;
  --blue-chip-rgb: 46 95 163;
  --blue-chip-oklch: oklch(0.487 0.122 257.2);
}

.element {
  color: var(--blue-chip);
  background-color: hsl(215 56% 41%);
  border-color: oklch(0.487 0.122 257.2);
}

Tailwind CSS v4

@theme {
  --color-blue-chip: #2e5fa3;
  --color-blue-chip-50: #e1f7ff;
  --color-blue-chip-100: #d0eaff;
  --color-blue-chip-200: #b5d6ff;
  --color-blue-chip-300: #92b9f6;
  --color-blue-chip-400: #6fa0e6;
  --color-blue-chip-500: #4e87d5;
  --color-blue-chip-600: #4372b4;
  --color-blue-chip-700: #355b91;
  --color-blue-chip-800: #23436c;
  --color-blue-chip-900: #172e4c;
  --color-blue-chip-950: #081b32;
}

SCSS

$blue-chip: #2e5fa3;
$blue-chip-rgb: 46, 95, 163;
$blue-chip-light: mix(#fff, $blue-chip, 20%);
$blue-chip-dark: mix(#000, $blue-chip, 20%);

.element {
  color: $blue-chip;
  box-shadow: 0 0 0 2px rgba($blue-chip, 0.35);
}