diff --git a/css/main.css b/css/main.css
index 70110c0dd0e3d47a4c638289a0ea8f93f32d3384..646c0e0694a1a061738224340eb9c0719c872dc2 100644
--- a/css/main.css
+++ b/css/main.css
@@ -309,4 +309,8 @@ label {
 }
 .btn-selected:hover {
     background-color: #8E8E8E;
+}
+
+.btn-group > .btn {
+    background-color: #ccc;
 }
\ No newline at end of file