Ion-item theming doesn't work

I want to change the background color of the and remove the bottom bar from .
This is the css:

ion-item {
    padding: 10px;
    align-items: center;
    border-bottom: transparent !important;

This is the HTML:

      <ion-label position="stacked">Email</ion-label>
      <ion-input [(ngModel)]="email" type="email"></ion-input>

This is the outcome: (pardon the autocomplete)

What have you tried in the CSS to change the background of the ion-item?