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
colors
navbar
rfc2231
angularjs-filter
aws-lambda-go
micronaut-security
flutter-razorpay
or-operator
oxygenxml
at-command
java-13
redhat-containers
gitlab-ee
tkinter
formtastic
silverlight-5.0
reactql
writeonly
clouddevelopmentkit
state-pattern
demographics
tridion
compiler-flags
amcharts4
video4linux
ember-cli
viewresult
nothing
angular-di
wordfence