#mainCanvas {
    border: 1px solid black;
    box-shadow: 2px 3px 2px rgba(0, 0, 0, 0.4);
    height: auto;
    width: auto;

    /* Grow to fill available space */
    flex-grow: 1;

    background-color: white;

    /* iOS can try to select the Canvas. We don't want that. */
    user-select: none;
}

* {
    user-select: none;
}

body {
    /*
     Flexbox display: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox
     Makes everything in body grow/shrink with body.
    */
    display: flex;

    /* Arrange things in the body in a column */
    flex-direction: column;

    /*
     Touchscreen devices: Tap and drag should trigger
     our touch actions, not the browser's.
     */
    touch-action: none;

    margin: 0;

    width: 100vw;
    height: 100vh;
}

:root {
    padding: 0;
}