diff --git a/doc/_static/mpl.css b/doc/_static/mpl.css
index 7cf24a748b0a..360aaac57604 100644
--- a/doc/_static/mpl.css
+++ b/doc/_static/mpl.css
@@ -99,3 +99,13 @@ table.property-table td {
     display: inline-block;
     margin: 0 0.5em;
 }
+
+/* Make inheritance images have a scroll bar if necessary. */
+div.graphviz {
+    border: 1px solid lightgrey;
+    max-height: 50em;
+    overflow: auto;
+}
+img.graphviz.inheritance {
+    max-width: none;
+}
diff --git a/doc/conf.py b/doc/conf.py
index 80282c70a7bb..dd7ba1cebf9e 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -619,7 +619,12 @@ def js_tag_with_cache_busting(js):
 
 numpydoc_show_class_members = False
 
-inheritance_node_attrs = dict(fontsize=16)
+# We want to prevent any size limit, as we'll add scroll bars with CSS.
+inheritance_graph_attrs = dict(dpi=100, size='1000.0', splines='polyline')
+# Also remove minimum node dimensions, and increase line size a bit.
+inheritance_node_attrs = dict(height=0.02, margin=0.055, penwidth=1,
+                              width=0.01)
+inheritance_edge_attrs = dict(penwidth=1)
 
 graphviz_dot = shutil.which('dot')
 # Still use PNG until SVG linking is fixed