diff --git a/docs/fix_katex.css b/docs/fix_katex.css
index f82e279..7dc7d1f 100644
--- a/docs/fix_katex.css
+++ b/docs/fix_katex.css
@@ -1,3 +1,9 @@
 .md-typeset svg {
   max-width: unset !important;
 }
+
+img {
+  display: block;
+  margin-left: auto;
+  margin-right: auto;
+}