diff --git a/sphinx_togglebutton/_static/togglebutton.css b/sphinx_togglebutton/_static/togglebutton.css
index 54a6787..8887e0c 100644
--- a/sphinx_togglebutton/_static/togglebutton.css
+++ b/sphinx_togglebutton/_static/togglebutton.css
@@ -43,6 +43,7 @@
     margin: 0;
     opacity: 0;
     visibility: hidden;
+    display: block;
 }
 
 /* General button style and position*/
@@ -157,4 +158,4 @@ details.toggle-details[open] summary ~ * {
     details.toggle-details summary {
         display: none;
     }
-}
\ No newline at end of file
+}