Environment variables

FREESTYLER_PREFIX — prefix to use for all CSS class names.
FREESTYLER_NUMBERS_TO_PX — will automatically add px to number values where necessary.
FREESTYLER_JSXSTYLE_MEDIA_QUERIES — enables jsxstyle media query syntax.
FREESTYLER_NO_BODY_CSS — don't allow to inject <style> tags in <body>, useful for AMP SSR.