I tried to setup PrimeFlex (3.0.1) for PrimeFaces (10.0.0). I used css files as provided in dist folder of PrimeFlex repo. Also I followed the instructions give
non-unicode
phppgadmin
middleware
google-cloud-billing
azure-logic-apps
mplot3d
byebug
sphinx-napoleon
turbo-prolog
delimitedfile
geonames
datapoint
amazon-vpc
mpxj
gomega
react-material
tabnavigator
google-goggles
fputcsv
nscontrol
garden
smack
clasp
series
dart-unittest
binning
biztalk
plural
object
ecs-taskdefinition