diff --git a/src/source/_static/custom.css b/src/source/_static/custom.css
index 4ad4dac55..27f7bfc3d 100644
--- a/src/source/_static/custom.css
+++ b/src/source/_static/custom.css
@@ -5,10 +5,17 @@ div.sphinxsidebar {
     word-wrap: break-word;
     overflow-wrap : break-word;
     overflow-y: scroll;
+    scrollbar-width: none;     /* Firefox */
+    -ms-overflow-style: none;  /* IE 10+ */
     top: 0;
     bottom: 0;
 }
 
+div.sphinxsidebar::-webkit-scrollbar {  /* WebKit */
+  width: 0px;
+}
+
+
 div.sphinxsidebarwrapper p.logo {
     padding: 0;
     margin: -10px 0 0 0px;