Modena Documentation

Box Size
Class GroupClass NameInstructions
Box SizingBoxSizeContentThis is the Default setting. The width and height properties (and min/max properties) include only the content. Border, padding, or margin are not included

BoxSizeBorderThe width and height properties (and min/max properties) include content, padding and border, but not the margin

Box Sizing : BoxSizeBorder (same width with below box)
Box Sizing : BoxSizeContent
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