How does css implement that all outer margins except the left margin are auto

This article mainly introduces css how to achieve all the outer margins except the left margin is auto, the article introduces in great detail, has a certain reference value, interested friends must read it!

Let's look at another example. If you want all margins except the left margin to be auto (the left margin is 20px):

P {margin: auto auto auto 20px;}

Similarly, only in this way can you get the effect you want. The problem is that typing these auto is a bit troublesome. If you just want to control the outer margin on one side of the element, use the single-sided outer margin attribute.

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