diff --git a/client/styles/components/_p5-light-codemirror-theme.scss b/client/styles/components/_p5-light-codemirror-theme.scss
index c66b81d5..fb5bf759 100644
--- a/client/styles/components/_p5-light-codemirror-theme.scss
+++ b/client/styles/components/_p5-light-codemirror-theme.scss
@@ -90,7 +90,6 @@ $p5-light-activeline: rgb(207, 207, 207);
 
 .cm-s-p5-light .CodeMirror-activeline-gutter {
   background-color: #ECECEC;
-  border-right: 1px solid #ddd;
 }
 
 .cm-s-p5-light .cm-error {