How do I enlarge/stretch the sequence diagram?

[gitterdonewell]

I'm working in the online Live Editor at mermaid.live. Created a nice sequence diagram that has 6 participants with the loop and break sections. However, when I click on the "Full Screen", the rendered diagram looks like squeezed to the middle with tiny text. There are plenty of spaces on the left and right sides (like 30% empty space on the right side and 30% empty space on the left side). I would like the diagram to be enlarged to fit the full screen. How can I enlarge the squeezed up sequence diagram on the live editor?