Update README.md

README.md

@@ -7,7 +7,7 @@ Pull the latest fenics Docker image
 
 
 ## Create docker container named LDD-TPR with graphical display, share folder `pwd`:
-
+```
   docker run --dns=129.69.252.252 -it --env HOST_UID=$(id -u $USER) --env HOST_GID=$(id -g $USER) --env DISPLAY=unix$DISPLAY --device /dev/dri --volume /tmp/.X11-unix:/tmp/.X11-unix:rw --volume $(pwd):/home/fenics/shared --name LDD-TPR quay.io/fenicsproject/stable:latest /bin/bash