diff --git a/src/app/styles.less b/src/app/styles.less
index 7ddcc68cb..d9148838b 100644
--- a/src/app/styles.less
+++ b/src/app/styles.less
@@ -83,5 +83,6 @@
     right: 0;
     bottom: 0;
     left: 0;
+    z-index: 0;
     background-color: @colorbgmain;
 }
\ No newline at end of file