diff --git a/js/index.js b/js/index.js
index 2d42603..a7bf168 100644
--- a/js/index.js
+++ b/js/index.js
@@ -110,7 +110,8 @@ $(function(){
       }
       if($(this).children()[1].innerText=='电子信息'){
           $('.second3Title>.title')[0].innerText = '电子信息'
-          $('.section3').css ('background','url(images/电子信息-bg.jpg) center top no-repeat')
+          $('.section3').css ('background','url(images/电子信息-bg.jpg) no-repeat')
+          $('.section3').css ('backgroundSize','cover')
           $('.second3Title>.title')[0].innerText = '电子信息'
           $('.second3Title>p')[0].innerHTML = 'ELECTRONIC<br>INFORMATION'
           $('.second3Title>.textsecond3')[0].innerHTML = '重点关注计算机与智能消费设备制造、信息通信、新型显示、集成电路、电子元器件与专用材料产业、人工智能等领域'