diff --git a/images/首页-banner1.jpg b/images/首页-banner1.jpg
index ffe3c6d..ef1f835 100644
Binary files a/images/首页-banner1.jpg and b/images/首页-banner1.jpg differ
diff --git a/images/首页-banner2.jpg b/images/首页-banner2.jpg
index 36258d2..195d896 100644
Binary files a/images/首页-banner2.jpg and b/images/首页-banner2.jpg differ
diff --git a/images/首页-banner3.jpg b/images/首页-banner3.jpg
index da3ecfa..23b82ba 100644
Binary files a/images/首页-banner3.jpg and b/images/首页-banner3.jpg differ
diff --git a/images/首页-banner6.jpg b/images/首页-banner6.jpg
index af65fcd..050f24d 100644
Binary files a/images/首页-banner6.jpg and b/images/首页-banner6.jpg differ
diff --git a/js/index.js b/js/index.js
index 8a45be9..48b85bf 100644
--- a/js/index.js
+++ b/js/index.js
@@ -88,21 +88,21 @@ $(function(){
   $('.electricItem').mouseenter(function(){
       // console.log($(this).parent().siblings().children().children('.addIon'))
       $(this).css('background','rgba(19,75,161,0.8)')
-      $(this).parent().siblings().children().css('background','transparent center top no-repeat')
+      $(this).parent().siblings().children().css('background','transparent 100% 100% no-repeat')
       $($(this).children()[3]).css('display','none')
       $($(this).children()[2]).css('display','block')
       $($(this).parent().siblings().children().children('button')).css('display','none')
       $($(this).parent().siblings().children().children('.addIon')).css('display','block')
       $('.section3').css ('transition', '1s')
       if($(this).children()[1].innerText=='先进材料'){
-          $('.section3').css ('background','url(images/先进材料-bg.jpg) center top no-repeat')
+          $('.section3').css ('background','url(images/先进材料-bg.jpg) 100% 100% no-repeat')
           $('.second3Title>.title')[0].innerText = '先进材料'
           $('.second3Title>p')[0].innerHTML = 'ADVANCED<br>MATERIALS'
           $('.second3Title>.textsecond3')[0].innerHTML = '重点关注先进钢铁材料、先进有色金属材料、先进石化化工新材料、先进无机非金属材料、高性能纤维及制品和复合材料、前沿新材料等领域'
       }
       if($(this).children()[1].innerText=='装备制造'){
           $('.second3Title>.title')[0].innerText = '装备制造'
-          $('.section3').css ('background','url(images/装备制造-bg.jpg) center top no-repeat','border')
+          $('.section3').css ('background','url(images/装备制造-bg.jpg) 100% 100% no-repeat','border')
           $('.second3Title>.title')[0].innerText = '装备制造'
           $('.second3Title>p')[0].innerHTML = 'EQUIPMENT<br>MAFUFACTURING'
           $('.second3Title>.textsecond3')[0].innerHTML = '重点关注高端装备、新能源、汽车及零部件、航空航天等领域'
@@ -116,7 +116,7 @@ $(function(){
       }
       if($(this).children()[1].innerText=='医药生物'){
           $('.second3Title>.title')[0].innerText = '医药生物'
-          $('.section3').css ('background','url(images/医药生物-bg.jpg) center top no-repeat')
+          $('.section3').css ('background','url(images/医药生物-bg.jpg) 100% 100% no-repeat')
           $('.second3Title>.title')[0].innerText = '医药生物'
           $('.second3Title>p')[0].innerHTML = 'PHARMACEUTICAL<br>BIOLOGY'
           $('.second3Title>.textsecond3')[0].innerHTML = '重点关注创新医药、高端医疗器械、CXO（合同研发生产组织）、BT（生物技术）+IT（信息技术）融合、产业链配套、商贸供应链、医'