diff --git a/docs/unipush-v2.md b/docs/unipush-v2.md
index 19d0d5a221f00f74c1e259057afe72383dfef9f3..677ce13f3d678fab11587b0949e5181bdcba0cef 100644
--- a/docs/unipush-v2.md
+++ b/docs/unipush-v2.md
@@ -15,6 +15,7 @@
 	}
 	.join-group-chat:hover img{
 		position: absolute;
+                background: #FFF;
 		top: 25px;
 		right: 0;
 		display: block;