Summerday Blue

CSS

:root {
  --summerday-blue: #376698;
  --summerday-blue-rgb: 55 102 152;
  --summerday-blue-oklch: oklch(0.501 0.096 251.6);
}

.element {
  color: var(--summerday-blue);
  background-color: hsl(211 47% 41%);
  border-color: oklch(0.501 0.096 251.6);
}

Tailwind CSS v4

@theme {
  --color-summerday-blue: #376698;
  --color-summerday-blue-50: #e3f7ff;
  --color-summerday-blue-100: #d2eaff;
  --color-summerday-blue-200: #b8d7fd;
  --color-summerday-blue-300: #95bbe8;
  --color-summerday-blue-400: #74a2d5;
  --color-summerday-blue-500: #548ac3;
  --color-summerday-blue-600: #4875a5;
  --color-summerday-blue-700: #395d84;
  --color-summerday-blue-800: #274562;
  --color-summerday-blue-900: #1a2f45;
  --color-summerday-blue-950: #0a1c2d;
}

SCSS

$summerday-blue: #376698;
$summerday-blue-rgb: 55, 102, 152;
$summerday-blue-light: mix(#fff, $summerday-blue, 20%);
$summerday-blue-dark: mix(#000, $summerday-blue, 20%);

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