GLRIDB-379 add medium css class
GLRIDB-379 add medium css class

Manual merge because pull request 118 has unknown merge conflicts
mwernimont/glri-catalog,USGS-CIDA/glri-catalog,mwernimont/glri-catalog,USGS-CIDA/glri-catalog,jlucido2/glri-catalog,jlucido2/glri-catalog,ee-usgs/glri-catalog,mwernimont/glri-catalog,USGS-CIDA/glri-catalog,jlucido2/glri-catalog,ee-usgs/glri-catalog,ee-usgs/glri-catalog