added min-height to columns, to prevent collapse.
added min-height to columns, to prevent collapse.

unicefuganda/edtrac,catalpainternational/rapidsms,peterayeni/rapidsms,lsgunth/rapidsms,dimagi/rapidsms-core-dev,ken-muturi/rapidsms,catalpainternational/rapidsms,peterayeni/rapidsms,unicefuganda/edtrac,unicefuganda/edtrac,dimagi/rapidsms-core-dev,dimagi/rapidsms,lsgunth/rapidsms,eHealthAfrica/rapidsms,catalpainternational/rapidsms,lsgunth/rapidsms,lsgunth/rapidsms,ken-muturi/rapidsms,ehealthafrica-ci/rapidsms,caktus/rapidsms,peterayeni/rapidsms,ken-muturi/rapidsms,dimagi/rapidsms,eHealthAfrica/rapidsms,ehealthafrica-ci/rapidsms,peterayeni/rapidsms,caktus/rapidsms,catalpainternational/rapidsms,rapidsms/rapidsms-core-dev,ehealthafrica-ci/rapidsms,eHealthAfrica/rapidsms,rapidsms/rapidsms-core-dev,caktus/rapidsms