export function getCssVarValue(variableName: string, fallback = ""): string {
  const prismRoot = document.querySelector(".prism-css") as HTMLElement | null;
  const value = prismRoot
    ? getComputedStyle(prismRoot).getPropertyValue(variableName).trim()
    : getComputedStyle(document.documentElement)
        .getPropertyValue(variableName)
        .trim();
  return value || fallback;
}