更新样式

src/views/courseList/index.module.less

@@ -23,6 +23,7 @@
     background-position: center;
     background-size: 50%;
     flex-shrink: 0;
+    object-fit: cover;
 
     &>img {
       display: block;
@@ -204,9 +205,11 @@
     z-index: 99;
   }
 }
-.periodItemModel{
+
+.periodItemModel {
   position: relative;
-  .periodTip{
+
+  .periodTip {
     position: absolute;
     left: -7px;
     top: 0;