diff --git a/docs/README.md b/docs/README.md
index fba7665..ec8033d 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -29,7 +29,7 @@ features:
 
 <video width="100%" height="630" src="./images/pro/Tsinghua.mp4" controls autoplay loop muted></video>
 
-<div style="position: relative; width: 100%; height: 0; padding-bottom: 75%;"><iframe src="//player.bilibili.com/player.html?aid=1454148484&bvid=BV15i421k7ak&cid=1531825155&page=1&high_quality=1" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true" style="position: absolute; width: 100%; height: 100%; left: 0; top: 0;"> </iframe></div>
+<div style="position: relative; width: 100%; height: 0; padding-bottom: 100%;"><iframe src="//player.bilibili.com/player.html?aid=1454148484&bvid=BV15i421k7ak&cid=1531825155&page=1&high_quality=1" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true" style="position: absolute; width: 100%; height: 100%; left: 0; top: 0;"> </iframe></div>
 
 <!-- <div align=center>
 <img src="./images/iori-1.jpg" width="498"/>