feat: 活动介绍支持滚动

src/pages/Activities/Activities.scss

@@ -163,7 +163,7 @@
         top: 97px;
         left: 10px;
         right: 10px;
-        bottom: 0;
+        height: 184px;
         font-family: "PingFang SC";
         font-style: normal;
         font-weight: 400;

src/pages/Coupons/CouponList/CouponList.scss

@@ -267,8 +267,6 @@
       color: #7a7e8d;
       opacity: 0.8;
       margin-bottom: 2px;
-      overflow-x: hidden;
-      overflow-y: auto;
     }
     .desc {
       font-weight: 600;