import { css } from '@lion/core'; import { LionTabs } from '@lion/tabs'; export class LeaTabs extends LionTabs { static get styles() { return [ super.styles, css` :host { background: #222; display: block; padding: 20px; } `, ]; } connectedCallback() { super.connectedCallback(); this._setupFeature(); } _setupFeature() { // being awesome } } customElements.define('lea-tabs', LeaTabs);