Improve hierarchical facet layout

src/client/components/Tree.js

@@ -126,6 +126,7 @@ class Tree extends Component {
             treeData={this.state.treeData}
             onChange={treeData => this.setState({ treeData })}
             canDrag={false}
+            rowHeight={30}
             // Custom comparison for matching during search.
             // This is optional, and defaults to a case sensitive search of
             // the title and subtitle values.

src/client/index.html

@@ -34,8 +34,8 @@
       font-size: 14px;
       font-family: 'Roboto', sans-serif;
     }
-    .rstcustom__expandButton {
-      margin-top: 1px
+    .rstcustom__rowWrapper {
+      display: flex;
     }
     .leaflet-popup-scrolled {
       border: 0px;