Select an inner button element using parent element's class

Question

Can you tell me how can I select an inner button element using parent element's class?

.html

    <m-spinner-button [options]="spinner" (click)="submit()" 
         class="accent">Recupera Password</m-spinner-button>

I have tried this. But it is not working. Any clue?

m-spinner-button .accent>button {
    background-color: #669adf !important;
}

Runtime: