Set a default width and height
Set a default width and height

Set the default width and height for the resize mixin to be 0 so that we don't
get error resulting from undefined values in the SVG viewBox attribute.

unicef/polio,unicef/polio,SeedScientific/polio,unicef/polio,unicef/rhizome,SeedScientific/polio,SeedScientific/polio,SeedScientific/polio,unicef/rhizome,unicef/rhizome,SeedScientific/polio,unicef/polio,unicef/rhizome