diff --git a/public/assets/wechat/send_class_list.html b/public/assets/wechat/send_class_list.html
index 72a52fc3f..b6d250d5d 100644
--- a/public/assets/wechat/send_class_list.html
+++ b/public/assets/wechat/send_class_list.html
@@ -19,6 +19,6 @@
         <!--<li ng-click="selectCourse(course)" ng-class="{'border-bottom-none': $last }" ng-repeat="course in courses"><img src="/images/wechat/dot.png" width="15px" class="class-list-dot" /><span class="fl ml10 class-list-name hidden">{{course.name}}</span><span ng-class="['login-box', 'fr', 'mr5', 'mt12', {'checked': course.checked}]"></span></li>-->
     <!--</ul>-->
 
-    <div ng-show="syllabuses.length>0" class="btn2 bg-blue" ng-click="sendToCourses()">发送</div>
+    <div ng-show="syllabuses.length>0" class="fixed-bottom-btn btn3 bg-blue" ng-click="sendToCourses()">发送</div>
     <my-alert message="alertService.message" title="alertService.title" visible="alertService.visible" cb="alertService.cb"></my-alert>
 </div>
diff --git a/public/stylesheets/weui/weixin.css b/public/stylesheets/weui/weixin.css
index cc3e3151a..80f51d5d9 100644
--- a/public/stylesheets/weui/weixin.css
+++ b/public/stylesheets/weui/weixin.css
@@ -86,6 +86,8 @@ a.underline {text-decoration:underline;}
 .bg-blue:not(.btn-disabled):active {background-color:#2780c2;}
 .btn-disabled {background-color:#ccc !important;}
 .btn2 {width:145px; height:35px; color:#fff; font-size:15px; line-height:35px; text-align:center; vertical-align:middle; margin:18px auto 20px auto; border-radius:50px; display:block;}
+.btn3 {width:145px; height:35px; color:#fff; font-size:15px; line-height:35px; text-align:center; vertical-align:middle; border-radius:50px; display:block;}
+.fixed-bottom-btn {position:fixed; bottom:5px; left:50%; transform:translate(-50%,0);}
 
 /*tab*/
 .tab-wrap {position:relative; width:100%; line-height:38px; display:-webkit-box; display:-moz-box; display:-ms-flexbox; display:-webkit-flex; display:flex; font-size:13px; background-color:#fff;}