diff --git a/b/downHelp.html b/b/downHelp.html
index 7943239..9a68eaa 100644
--- a/b/downHelp.html
+++ b/b/downHelp.html
@@ -24,7 +24,7 @@
 				overflow: hidden;
 				position: relative;
 				font-size: 0;
-				background: url(img/bg2.png) no-repeat;
+				background: url(img/bg2.png?v=202105271512) no-repeat;
 				background-size: 100% 100%;
 				width: 10rem;
 				height: 23.493rem
diff --git a/b/img/bg2.png b/b/img/bg2.png
index 96603d3..7da1f8a 100644
Binary files a/b/img/bg2.png and b/b/img/bg2.png differ
diff --git a/b2/downHelp.html b/b2/downHelp.html
index 7943239..9a68eaa 100644
--- a/b2/downHelp.html
+++ b/b2/downHelp.html
@@ -24,7 +24,7 @@
 				overflow: hidden;
 				position: relative;
 				font-size: 0;
-				background: url(img/bg2.png) no-repeat;
+				background: url(img/bg2.png?v=202105271512) no-repeat;
 				background-size: 100% 100%;
 				width: 10rem;
 				height: 23.493rem
diff --git a/b2/img/bg2.png b/b2/img/bg2.png
index 96603d3..7da1f8a 100644
Binary files a/b2/img/bg2.png and b/b2/img/bg2.png differ