修改过期时间

 .time {
-  margin-top: 0.28rem;
+  margin-bottom: 0.28rem;
   font-size: 0.24rem;
   font-weight: 400;
   text-align: left;
@@ -19,7 +19,7 @@
 .file-item-bottom {
   display: flex;
   align-items: center;
-  margin-top: 0.25rem;
+  margin-bottom: 0.25rem;
   font-size: 0.28rem;
   font-weight: 500;
   text-align: left;