Several things about CSS centering

Horizontal centering:

1: Center the inline element and center its parent block element!

2: The block element is centered, margin-left, margin-right: auto; and pay attention to the width! If the width is 100%, it cannot be seen. If the width is 100%, do you still need to center it?

Vertical centering:

One: Set padding

Two: height = line-height

Three: display :table-cell vertical-align will work.

Four: Positioning and centering Various layout positioning can be solved!

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