Fix katex rendering of vector arrows.

Author: joaander

sphinx-doc/_static/fix-katex.css

@@ -0,0 +1,6 @@
+.katex .overlay {
+  background-color: transparent;
+  opacity: 1;
+  position: static;
+  transition: all 0s ease 0s;
+}

sphinx-doc/conf.py

@@ -35,9 +35,7 @@
 if find_spec("sphinxcontrib.katex") is not None:
     extensions.append("sphinxcontrib.katex")
 
-    katex_options = r"""{
-        output: 'mathml',
-    }"""
+    html_css_files = ['fix-katex.css']
 else:
     extensions.append("sphinx.ext.mathjax")