diff --git a/app.css b/app.css
index 6c3cc53..1b93c20 100644
--- a/app.css
+++ b/app.css
@@ -9,6 +9,9 @@ circle {
 circle:hover {
     r:10;
     fill: blue;
+}
+circle:active {
+    fill: red;
 }
  svg {
      overflow: visible;