A css box includes margin, border, padding, and size.
Please refer to Grid 12 system for all sizes of a box.
For each margin (m), border (b) or padding (p)
We have 4 sides: t = top, b = bottom, l = left, r = right. Also x = left + right, y = top + bottom. Without sides means all sides.
Each of above in 5 scales: -0 = 0, -1 = .25rem, -2 = .5rem, -3 = 1rem, -4 = 1.5rem, -5 = 3rem. For margin has additional scale = auto. For border the unit is in px
eg mt-3 = margin-top:3rem / p-2 = padding:.5rem / bx-5 = border-right:3px;border-left:3px
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