#30A3E7

CSS

:root {
  --high-blue: #30a3e7;
  --high-blue-rgb: 48 163 231;
  --high-blue-oklch: oklch(0.684 0.141 240.3);
}

.element {
  color: var(--high-blue);
  background-color: hsl(202 79% 55%);
  border-color: oklch(0.684 0.141 240.3);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #30a3e7;
  --color-high-blue-50: #d3fbff;
  --color-high-blue-100: #bfeeff;
  --color-high-blue-200: #9edcff;
  --color-high-blue-300: #73c0f9;
  --color-high-blue-400: #40a8e9;
  --color-high-blue-500: #008fd9;
  --color-high-blue-600: #0079b7;
  --color-high-blue-700: #006193;
  --color-high-blue-800: #00486d;
  --color-high-blue-900: #00324d;
  --color-high-blue-950: #001d33;
}

SCSS

$high-blue: #30a3e7;
$high-blue-rgb: 48, 163, 231;
$high-blue-light: mix(#fff, $high-blue, 20%);
$high-blue-dark: mix(#000, $high-blue, 20%);

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