```html
<ion-split-pane contentId="main">
  <!--  the side menu  -->
  <ion-menu contentId="main">
    <ion-header>
      <ion-toolbar>
        <ion-title>Menu</ion-title>
      </ion-toolbar>
    </ion-header>
  </ion-menu>

  <!-- the main content -->
  <ion-router-outlet id="main"></ion-router-outlet>
</ion-split-pane>
```
