How to override styling in :host?

For a specific media query I want to override the styling of ion-content. I am doing it with an ID to have a high specifity:

@media (min-width: 992px) {
    #content {
        width: 50rem;
        margin: 0 auto !important;

As you can see in the following screenshot (highlighted in yellow) the previous styling of margin in :host is not getting overridden. As soon I delete !important of it, my css rules are getting applied.

How can I override :host styling?