HarmonyOS 通过web显示pdf时，怎么隐藏黑色的头部？

Column() { 
  Web({ src: "resource://rawfile/1.pdf?#toolbar=0&navpanes=0", controller: this.controller }) 
    .domStorageAccess(true) 
} 
.height('100%') 
.width('100%')

import web_webview from '@ohos.web.webview'; 
 
@Entry 
@Component 
struct Base64PDFPage { 
  @State message: string = 'Hello World'; 
  @State base64: string = "此处放base64码"; 
  @State url: string = ""; 
  controller: web_webview.WebviewController = new web_webview.WebviewController(); 
  aboutToAppear(): void { 
    this.url = `data:Application/pdf;base64,${this.base64}#toolbar=0`; 
  } 
  build() { 
    Scroll() { 
      Column() { 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
        Button('加载PDF').onClick(()=>{ 
          this.controller.loadData( 
            this.base64,//base64码 
            "Application/pdf", 
            "base64" 
          ); 
        }) 
        Web({ src: this.url, controller: this.controller }) 
          .domStorageAccess(true) 
          .height(1000) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}