Assistance is appreciated

Tell us what’s happening:
First I would like to point out that I do not need assistance with the lesson itself. I do however have a question regarding the property values used in the lesson. As you can see below I deleted all irrelevant code. In the code below, what does the margin: 0.5rem 0; mean? I understand what 0.5rem is but what does that last 0 represent?

label {
 display: block;
 margin: 0.5rem 0;
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Challenge: Step 14

Link to the challenge:

They are using the shorthand margin property so the 0 is for left-right margin

I just found that in an online search. However, would it not be top and bottom? I thought when only two were used it used top then bottom.

First number is top bottom, second number is left-right
MDN has a good illustration

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I also just found a nice illustration on W3.

Thank you for your assistance. It went over shorthand but I completely forgot it somehow. Its good to have a refresher!