Avoid spacing in area charts

[jaimeiniesta]

Area charts sometimes show a very thin vertical spacing between the columns. It seems to depend on the viewport width, screen resolution and amount of data, but I think that the idea with an area chart is that it's seen as a single block (unless some data-spacing-* is specified), right?

For example, in https://chartscss.org/charts/area/ I see this:

How can this be polished so no spacing is shown?