How to remove gap between graph element

[wss29]

Hi,
I create a node containing three elements 'left', 'center', and 'right'. There is a problem that confuses me. There is always some gap between the three parts, I do not know how to remove this gap.

I hope it looks like follow picture, with no gap between them

I do not add any margin or padding property in css. I do not set hGap in the layout options

[CamilleLetavernier]

Hi,

The default layout options for hbox and vbox include a non-0 gap, as well as some padding. If you're using one of these layouts, you may need to explicitly set these values to 0 in the layout options. Child nodes may also have their own padding, which may or may not need to be set to 0.

protected override getDefaultLayoutOptions(): HBoxLayoutOptionsExt {
        return {
            resizeContainer: true,
            paddingTop: 5,
            paddingBottom: 5,
            paddingLeft: 5,
            paddingRight: 5,
            paddingFactor: 1,
            hGap: 1,
[...]

[wss29]

Thank you very much.