Borders
Borders are similar to margins and padding but are more complicated because they can have their own color and style.
The size options for borders are more limited because you typically donât want borders to be as big as margins might get. More importantly, the size options for borders are measured in pixels, not rem. The most basic border option is simply border, which gives you a 1-pixel border in all four directions.
After that you have .border-{side}-{size}, where the side is optional. But unlike padding and margins, a dash is included before the side. The side options are: -b, -t, -l, and -r, and -x and -y, which combine two sides. Not including a side applies the size to all four sides. The size is also optional: -0, -2, -4, and ...
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