body {
    margin: 0;
}

#whole-window {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

#pteropus-canvas {
    display: flex;
    flex-grow: 1;
    margin: 0.4rem;
}

#bottom-panel {
    display: flex;
    flex-grow: 0;
    margin: 0.4rem;
}

button {
    margin-left: 0.2rem;
    margin-right: 0.2rem;
}