Simple margin container.
Adds a top, left, bottom, and right margin to all [Control] nodes that are direct children of the container. To control the [MarginContainer]'s margin, use the [code]margin_*[/code] theme properties listed below.
[b]Note:[/b] Be careful, [Control] margin values are different than the constant margin values. If you want to change the custom margin values of the [MarginContainer] by code, you should use the following examples:
[codeblock]
# This code sample assumes the current script is extending MarginContainer.
var margin_value = 100
add_constant_override("margin_top", margin_value)
add_constant_override("margin_left", margin_value)
add_constant_override("margin_bottom", margin_value)
add_constant_override("margin_right", margin_value)
[/codeblock]
https://docs.godotengine.org/en/3.5.1/tutorials/ui/gui_containers.html
All direct children of [MarginContainer] will have a bottom margin of [code]margin_bottom[/code] pixels.
All direct children of [MarginContainer] will have a left margin of [code]margin_left[/code] pixels.
All direct children of [MarginContainer] will have a right margin of [code]margin_right[/code] pixels.
All direct children of [MarginContainer] will have a top margin of [code]margin_top[/code] pixels.