Cannot center-justify text in nodes?

I’m trying to replicate part of the diagram found here:

http://echo.mpiwg-berlin.mpg.de/content/scientific_revolution/harriot/harriot_manuscripts/maps/9.2.3_colour.pt

(which I myself made with a graphical editor).

Here is how I started:

graph LR;
      189[Add MS<br/>6789<br/>f. 189];
      188[Add MS<br/>6789<br/>f. 188];
      189-->188;

classDef page text-align:center;
class 188,189 page;

But I cannot get the text in each box to align in the center. I’ve been able to pass on all kinds of other CSS attributes using this format; but none of the text-align attributes seem to have any effect.

[RobertGoulding]

Thank you! But how do I do that with the stand-alone mermaid? That is, I’m just running it from the command line to produce images.

[mlbernauer]

@RobertGoulding you can use <center> for example… A[<center>My centered text</center>]-->B[<center>Some other text<br>with a line break</center>]