diff --git a/projects/Demo/Demo/wwwroot/css/app.css b/projects/Demo/Demo/wwwroot/css/app.css
index e7cc05a0..c6ccafb1 100644
--- a/projects/Demo/Demo/wwwroot/css/app.css
+++ b/projects/Demo/Demo/wwwroot/css/app.css
@@ -51,6 +51,8 @@ img.shot.zoom {
     .videoContainer #ptz {
         position:absolute;
         text-align:center;
+        width:300px;
+        margin:auto;
         left:0;
         right:0;
         bottom:0;