packagekit: Add stylesheet for the Buttons on 'Software Updates' page
packagekit: Add stylesheet for the Buttons on 'Software Updates' page

Closes #13657
garrett/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,deryni/cockpit,martinpitt/cockpit,deryni/cockpit,garrett/cockpit,garrett/cockpit,deryni/cockpit,cockpituous/cockpit,deryni/cockpit,cockpituous/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,cockpit-project/cockpit,deryni/cockpit,deryni/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,garrett/cockpit,cockpituous/cockpit,martinpitt/cockpit,cockpituous/cockpit,garrett/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,deryni/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,cockpituous/cockpit