diff --git a/edit.html b/edit.html
index 4306c86f..8da18e12 100644
--- a/edit.html
+++ b/edit.html
@@ -80,6 +80,9 @@
 			.CodeMirror {
 				border: solid #CCC 1px;
 			}
+			.CodeMirror-focused {
+				border-color: black;
+			}
 			.applies-to {
 				display: flex;
 			}