diff --git a/demo/biyadi/index.html b/demo/biyadi/index.html
index 2927da8..f0c33c4 100644
--- a/demo/biyadi/index.html
+++ b/demo/biyadi/index.html
@@ -139,10 +139,8 @@ var imgs = [
   './images/page10_s3.jpg',
   './images/page10_s4.jpg'
 ];
-function callback () {
-  render()
-}
-loadImg(imgs,callback)
+
+loadImg(imgs,render)
 
 function loadImg (imgs,callback) {
   var imgsLen = imgs.length;
diff --git a/demo/biyadi/style/style.css b/demo/biyadi/style/style.css
index f85e1b3..857f0cc 100644
--- a/demo/biyadi/style/style.css
+++ b/demo/biyadi/style/style.css
@@ -1,7 +1,6 @@
 body, #wrapper {
   overflow: hidden;
   position: relative;
-  background: #000;
 }
 
 .layer{
@@ -10,7 +9,7 @@ body, #wrapper {
   left: 0;
   width: 100%;
   height: 100%;
-  background: url('../images/back.png') no-repeat #fff;
+  background: url('../images/back.png') no-repeat;
   background-size: 100% 100%;
   z-index: 101
 }
@@ -40,6 +39,7 @@ body, #wrapper {
 #main div {
   background-position: center;
   position: relative;
+  background: #000;
 }
 
 #world, #start, #page2, #page3, #page4, #page5, #page6, #page7, #page8, #page9, #page10 {