diff --git a/src/components/gui/gui.css b/src/components/gui/gui.css
index 989601a57..821f55014 100644
--- a/src/components/gui/gui.css
+++ b/src/components/gui/gui.css
@@ -19,6 +19,12 @@
     */
     flex-direction: row;
     height: 100%;
+
+    /*
+        Stop scrollbar popping in and out from scratch-blocks border issue
+        https://github.com/LLK/scratch-gui/issues/318
+    */
+    overflow-y: hidden;
 }
 
 .editor-wrapper {