When I make my content I use Windows for previous and use an Ubuntu server to compile the complete website. The website was build with hugo extended (not using extended causes compiling errors).
I may have found the problem with the help of the inspection tool of Google Chrome :
When I disable the padding: .2rem .4rem;, it goes well as you can see.
Re-enable it brings back the space :
It refers to the line 4 of /themes/LoveIt/assets/css/_partial/_single/_code.scss.
I'm wondering now if it's an issue of if it's intentional. If it's an expected result please let me know.
If it is I'm sorry for the inconvenience and thank you a lot for your help.
I'm gonna try to put some highlight info to see if I can get rid of that.