cubicweb #3381435 [css] drop shadow.gif & use a couple of rules [validation pending]

prioritynormal
typeenhancement
done in3.18.0
load0.100
load left0.000
closed by#4f4342ec87ac [css] drop shadow.gif & use a couple of rules (closes #3381435)
patch[css] drop shadow.gif & use a couple of rules (closes #3381435) [applied]