dart - Changing background colour of a paper-dropdown-menu

Question

I have a paper-droopdown-menu that displays normally. But I would like to change the backgroud colour as shown in the graphic below

I have tried the following but it did not affect the background.

 * /deep/ paper-dropdown-menu::shadow #menu {
    background-color: #eee;
    border: 1px solid #ccc;
}

Answer 1

  paper-dropdown-menu {
    background-color: red;
  }

或者只是输入元素

  paper-dropdown-menu::shadow #control {
    background-color: red;
  }

如果这不是您想要的，您能否将 HTML 添加到您的问题中，以生成您在屏幕截图中的布局。