Read the official Contao announcements.
TYPOlight 2.3.2 is available
by Leo Feyer – Announcements
TYPOlight version 2.3.2 is available and can be downloaded at github.com. Please note that the built-in CSS framework has been completely redone and therefore make sure to use the layout merger tool and to check your existing style sheets. There is an important tutorial describing the changes in detail.