fix: h5 transparentTitle 失效的Bug

src/platforms/h5/components/page/index.vue

@@ -159,8 +159,7 @@ export default {
     titleNView = Object.assign({}, {
       type: this.navigationStyle === 'custom' ? 'none' : 'default'
     }, this.transparentTitle in titleNViewTypeList ? {
-      type: titleNViewTypeList[this.transparentTitle],
-      backgroundColor: 'rgba(0,0,0,0)'
+      type: titleNViewTypeList[this.transparentTitle]
     } : null, typeof titleNView === 'object' ? titleNView : (typeof titleNView === 'boolean' ? {
       type: titleNView ? 'default' : 'none'
     } : null))

src/platforms/h5/components/page/pageHead.vue

@@ -109,6 +109,7 @@ uni-page-head {
 uni-page-head .uni-page-head {
   position: fixed;
   left: 0;
+  top: 0;
   width: 100%;
   height: 44px;
   height: calc(44px + constant(safe-area-inset-top));