html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

/* The element Compose mounts into. It has to fill the viewport itself now that it sits between the
   body and the canvas, and it centres the spinner it holds until Compose takes over. */
#composeApp {
    width: 100%;
    height: 100%;
    text-align: center;
    align-content: center;
}