diff --git a/public/dahua/demo.html b/public/dahua/demo.html
index e17fa8d7..bf59afda 100644
--- a/public/dahua/demo.html
+++ b/public/dahua/demo.html
@@ -21,6 +21,7 @@
             padding: 0 0px !important;
             margin: 0!important;
             max-width: none;
+            height: 100vh;
         }
         .real-container,
         .record-container {
@@ -112,7 +113,7 @@
             readDom.style.width = '100%';
             readDom.style.marginLeft = '0px';
             document.getElementById('ws-real-player').style.marginBottom = '0px';
-            
+            document.getElementById('ws-real-player').style.height = '100%';
         }