Sidemenu background-color in Ionic-v4

Ionic Framework ionic-v3
1

Hi all,

i have a Ionic-v4-app with an sidemenu structured like that:

<ion-app>
  <ion-split-pane>
    <ion-menu>
      <ion-header>
        <ion-toolbar>
        </ion-toolbar>
      </ion-header>
      
      <ion-content>
        <ion-list>
        </ion-list>
      </ion-content>
    </ion-menu>
  </ion-split-pane>
</ion-app>

Now i want the have a background for the whole sidemenu (header, list, content, everything).
But it is unnecessary what i try, i don’t get it working.

I tried a background color for ion-menu and transparent background for header and content, but also not working.