diff --git a/packages/react/src/components/CodeMirror6.jsx b/packages/react/src/components/CodeMirror6.jsx
index aa90eb30..d76ac3d3 100644
--- a/packages/react/src/components/CodeMirror6.jsx
+++ b/packages/react/src/components/CodeMirror6.jsx
@@ -67,7 +67,7 @@ const highlightField = StateField.define({
                   }
                   let mark;
                   if (color) {
-                    mark = Decoration.mark({ attributes: { style: `outline: 4px solid ${color};` } });
+                    mark = Decoration.mark({ attributes: { style: `outline: 2px solid ${color};` } });
                   } else {
                     mark = Decoration.mark({ attributes: { class: `outline outline-2 outline-foreground` } });
                   }