diff --git a/extras/playground/app.js b/extras/playground/app.js
index 181d3bd5..bf72dff3 100644
--- a/extras/playground/app.js
+++ b/extras/playground/app.js
@@ -81,7 +81,7 @@ class TabbedEditor extends owl.Component {
     // remove this for xml/css (?)
     this.editor.session.setOption("useWorker", false);
     this.editor.setValue(this.props[this.state.currentTab], -1);
-    this.editor.setFontSize("13px");
+    this.editor.setFontSize("12px");
     this.editor.setTheme("ace/theme/monokai");
     this.editor.session.setMode(MODES[this.state.currentTab]);
     const tabSize = this.state.currentTab === "xml" ? 2 : 4;