Zoom content but not the navbar

Hi everyone,

I have a page with top and bottom navbar (ion-view + ion-nav-buttons), the pinch zoom changes the content but also the navbar… Do you know how to zoom only the ion-view content ?

My HTML code :

<meta name="viewport" content="initial-scale=1, maximum-scale=2, minimum-scale=1, width=device-width">
<ion-nav-buttons side="right" ng-show="false">
     My buttons
<ion-scroll zooming="true" direction="xy" style="height:100%;width:100%;">
     HTML content