Change size of modal dialog in Ionic Framework

demoModal.html

<ion-modal-view class="mymodal">
    ...
</ion-modal-view>

style.css

@media (min-width: 680px) {
  .mymodal {  
     width: 90%; 
     height: 90%; 
     top: 5%; 
     left: 5%; 
     right: 5%; 
     bottom: 5%;
  }
}