Centre the full virtual staining map

app.py

@@ -465,6 +465,8 @@ def build_virtual_opencell_section():
 
 # OpenCell's look for both tabs, each scoped to its own container, plus what only the titration needs
 CSS = viewer.CSS + viewer.scoped_css(page.SCOPE) + page.CSS
+# the full map is laid out while its tab is hidden, so Plotly falls back to a 700 px figure: centre it
+CSS += "#virtual-opencell .vo-umap-full .svg-container { margin: 0 auto; }\n"
 
 CITATION = """@article{zheng2026virtual,
   title   = {Virtual experiments bridge sequence and microscopy with generative models},