dialog组件样式优化

learnOnline/components/dialog/index.wxss

@@ -13,14 +13,14 @@
 .dialog-main {
   position: absolute;
   left: 50%;
-  top: 50%;
+  top: 20%;
   padding: 40rpx;
   width: 600rpx;
   margin: 0 auto;
   background: #fafafc;
   border-radius: 10rpx;
   font-size: 28rpx;
-  transform: translate(-50%, -50%);
+  transform: translate(-50%, 0);
 }
 .dialog-hd {
   display: flex;