Styles for demo page

demo-styles.css

<style>
    body {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        background: #fafafa;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    }

    section {
        margin: 50px 0;
    }

    .box {
        padding: 15px;
        width: 400px;
        display: block;
        background: #fff;
        box-shadow: 0 2px 4px 0 rgba(0,0,0,0.10);
        margin: 15px auto;
        border-radius: 5px;
    }
</style>