class CardComponent extends HTMLElement {
    constructor() {
        super();

        const shadowRoot = this.attachShadow({mode: "open"});

        shadowRoot.innerHTML = `
            <style>
                :host {
                    color: white;
                }
            </style>
            <div><h3><slot name="title"></slot></h3></div>
            <div><slot name="content"></slot></div>
        `;
    }
}

window.customElements.define("card-component", CardComponent);