Thank you for writing this plug-in! I've tried three others out there, and none work as well as yours. The one problem I've encountered so far is with a graph - the box size is really large. Here is a super simple mark down that shows the issue:

graph TD
A-->B

And here is what is generated (Chrome 80.0.3987.149 on Windows 10):

The HTML code being generated for these rectangles has a large height of 142.5:

<rect rx="0" ry="0" x="-20.0390625" y="-71.25" width="40.078125" height="142.5" class="label-container"></rect>

It does not appear to matter if I choose graph TD or graph LR - both have large rectangles.

My hosting platform is GitHub Wiki's, where I have no control over CSS/stylesheets (they filter out all styles). I've attempted to work around this using the class/style features of Mermaid but so far I've had no luck.

The only other chart type I've tried is classDiagram, and that is rendering correctly sized rectangles.