合并远程更改：更新回到顶部按钮样式

pages/index/index.wxss

@@ -1568,7 +1568,7 @@ wx-button:not([size=mini]) {
   display: flex;
   justify-content: center;
   align-items: center;
-  box-shadow: 0 6rpx 20rpx rgba(0, 0, 0, 0.15);
+  box-shadow: 0 4rpx 12rpx rgba(0, 0, 0, 0.15);
   border: 2rpx solid rgba(255, 255, 255, 0.4);
   opacity: 0;
   transform: translateY(20rpx);
@@ -1584,7 +1584,7 @@ wx-button:not([size=mini]) {
 }
 
 .back-to-top-icon {
-  font-size: 32rpx;
+  font-size: 24rpx;
   color: #1677ff;
   font-weight: 600;
   line-height: 1;