diff --git a/doc/_static/mpl.css b/doc/_static/mpl.css
index d54229f674fd..57505f0a972e 100644
--- a/doc/_static/mpl.css
+++ b/doc/_static/mpl.css
@@ -1029,7 +1029,6 @@ figcaption {
 .donate_button {
     clear: both;
     display: block;
-    width: 200px;
     margin: 30px auto 0;
 }