IO: Change Default Mask Colours

doesn’t the template include this piece of code?

#image-occlusion-canvas {
    --inactive-shape-color: #ffeba2;
    --active-shape-color: #ff8e8e;
    --inactive-shape-border: 1px #212121;
    --active-shape-border: 1px #212121;
    --highlight-shape-color: #ff8e8e00;
    --highlight-shape-border: 1px #ff8e8e;
}

I thought the change could be made so that it only applies to new users.

Not sure what options to include, really. If someone knows how to do it, go ahead.