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
php-5.5
angular2-pipe
autobogus
application.cfc
google-font-api
cornerradius
actuator
spring-cloud-circuitbreaker
codeready
tail
decoration
perfect-numbers
asp.net-core-signalr
content-length
fuzzy-search
passport-saml
aws-appsync
relative-path
height
azure-feature-manager
out-gridview
cypress-wait-until
ora-00900
mouseclick-event
audacity
xna-4.0
xamarin
character-properties
hostheaders
feed