Fix the matplotlib style usage

4 jobs for theo-cli in 36 minutes and 56 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #132330
docker
build_linux_27

00:06:27

82.0%
passed #132331
docker
build_linux_36

00:06:21

82.0%
passed #132332
macosx
build_macosx_27

00:36:56

82.0%
passed #132333
macosx
build_macosx_36

00:36:43

82.0%