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
textures
miracast
vuedraggable
writable
trust
d2xx
expressiveannotations
build.xml
multi-layer
axion-release-plugin
user-warning
causalml
eof
fastreport
password-policy
augmentedimage
minutes
c3p0
go-scheduler
whenever
spring-cloud-dataflow-ui
idle-timer
anyline
multiplechoicefield
graphql-spring-boot
copy-webpack-plugin
condition-variable
topological-sort
simplejdbccall
materialcardview