diff --git a/web_src/css/codemirror/base.css b/web_src/css/codemirror/base.css
index b435fb1342c0..aedf7d85608f 100644
--- a/web_src/css/codemirror/base.css
+++ b/web_src/css/codemirror/base.css
@@ -43,3 +43,7 @@
 .CodeMirror-focused {
   border-color: var(--color-primary) !important;
 }
+
+.CodeMirror :focus {
+  outline: none;
+}