You are browsing the old Contao 3 extension repository. Contao 3 is no longer maintained as of June 2019! You can find the Contao 4 extensions on extensions.contao.org.
Extensions > coverpicture
Cover picture (page picture)
Page-based images (cover images or background images)
This extension allows to display side-based images (cover images or background images). Images / background images can be inherited or overridden from page to page.