What are the commonly used horizontal and vertical center alignment methods in CSS?

1. Horizontal and vertical centering of text

text-align: center;    
line-height: 单前元素高度;

(Video tutorial recommendation: css video tutorial)

2. Horizontal and vertical centering of elements

1. Use absolute positioning

2. Use absolute positioning calc()

3. Use absolute positioning transform

4. Use display:flex;

Recommended tutorial: css quick start

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