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
jcrop
xfs
cardinality-estimation
urlhelper
scoped-type-variables
react-app-rewired
structure-of-arrays
and-operator
wunderground
terminal
ios-app-extension
git-bare
gsm
mt940
mailerlite
imaskjs
geopoints
hummingbird
cgdb
haskell-parsing
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azure-container-service
unstated
blueprint-osgi
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dispose
subclipse
fqdn
kompose
android-studio-4.2.2