body {
    margin: 0;
    padding: 0;
    color: rgba(255, 255, 255, 0.87);
    width: min(800px, 100vw);  /* Max 800px, but fits within screen */
    height: min(600px, 100vh);  /* Max 600px, but fits within screen */
    max-width: 100vw; /* Prevent anything from exceeding viewport */
    background-color: #ffffff;
}

#app {
    width: min(800px, 100vw);  /* Max 800px, but fits within screen */
    height: min(600px, 100vh);  /* Max 600px, but fits within screen */
    max-width: 100%;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}