/* Reset margin and padding to remove default spacing */
html, body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
}

/* Make the container fill the viewport */
.canvas-holder {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
}

/* Let the canvas fill the container fully */
.mainCanvas {
    display: block;  /* Remove inline element whitespace issue */
    width: 100%;
    height: 100%;
}