diff --git a/resources/ooui.less b/resources/ooui.less
new file mode 100644
index 0000000..efa2c96
--- /dev/null
+++ b/resources/ooui.less
@@ -0,0 +1,4 @@
+.oo-ui-defaultOverlay {
+	z-index: 101;
+	font-size: 0.95em;
+}
diff --git a/skin.json b/skin.json
index 525ee10..cb2e151 100644
--- a/skin.json
+++ b/skin.json
@@ -80,6 +80,7 @@
 	},
 	"ResourceModuleSkinStyles": {
 		"timeless": {
+			"+oojs-ui-core.styles": "resources/ooui.less",
 			"+ext.echo.styles.badge": "resources/extensions/Echo.less",
 			"+ext.visualEditor.core": "resources/extensions/VisualEditor.core.less",
 			"+ext.visualEditor.desktopArticleTarget.noscript": "resources/extensions/VisualEditor.article.less"