workadventure/front/dist/resources/html/warningContainer.html

<style>
    #warningMain {
        border-radius: 5px;
        height: 100px;
        width: 300px;
        background-color: red;
        text-align: center;
    }

    #warningMain h2 {
        padding: 5px;
    }
</style>

<main id="warningMain">
    <h2>Warning!</h2>
    <p>This world is close to its limit!</p>
</main>