The Developer guide for Neo4j Browser User Interface says that I can run :style, export it, modify it and drag it back to change the style. I try changing the default border width, and adding two new properties for nodes: text-align and shape, as explained in Graph Stylesheets 2:
node {
diameter: 50px;
color: #A5ABB6;
border-color: #9AA1AC;
border-width: 10px;
text-color-internal: #FFFFFF;
font-size: 10px;
text-align: "below";
shape: regtangle;
But only the border width changes. Why does the rest not work?