Improve styling of MessageStack
Improve styling of MessageStack

derekhe/Cura,lo0ol/Ultimaker-Cura,bq/Ultimaker-Cura,totalretribution/Cura,Curahelper/Cura,Curahelper/Cura,fieldOfView/Cura,DeskboxBrazil/Cura,quillford/Cura,bq/Ultimaker-Cura,senttech/Cura,hmflash/Cura,fieldOfView/Cura,markwal/Cura,ynotstartups/Wanhao,quillford/Cura,totalretribution/Cura,derekhe/Cura,ynotstartups/Wanhao,DeskboxBrazil/Cura,hmflash/Cura,fxtentacle/Cura,lo0ol/Ultimaker-Cura,senttech/Cura,markwal/Cura,ad1217/Cura,ad1217/Cura,fxtentacle/Cura