Styling ionic directives directly

Hi I’m currently at ionic 3.12.1 and I wanted to ask if there was any possibilities to style a directive directly. If I add css classes to the directives the css class won’t even show up.

<ion-list class="tracker-list">
        <ion-list-header class="tracker-header">
        <ion-item>Terminator II</ion-item>


I don’t think so. Post your ionic info output please.