调整图片占比

app/views/libraries/index.html.erb

@@ -1,4 +1,4 @@
-<img src="/images/educoder/teach_ex.jpg" width="100%"/>
+<img src="/images/educoder/teach_ex.jpg" class="teach_ex" width="100%"/>
 <div class="educontent">
   <div class="edu-back-white mb30 mt30">
     <p class="padding20-30 clearfix bor-bottom-greyE">

public/stylesheets/educoder/edu-main.css

@@ -1260,4 +1260,9 @@ html>body #ajax-indicator { position: fixed; }
 #trophyreturn i{
     font-size: 16px!important;
     color: #AAAAAA;
+}
+
+.teach_ex{
+    object-fit: cover;
+    height: 300px;
 }