html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}
/* Shown instead of the app when the browser can't run it (see browser-check.js). */
.fallback {
    box-sizing: border-box;
    max-width: 32rem;
    margin: 0 auto;
    padding: 4rem 1.5rem;
    font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: #1c1b1f;
}

.fallback h1 {
    font-size: 1.5rem;
    margin: 0 0 1rem;
}

.fallback[hidden] {
    display: none;
}