How to center a div? How to center an absolutely positioned div?

Centered div

(Recommended tutorial: css quick start)

Code implementation:

border: 1px solid red;margin: 0 auto; 
height: 50px;width: 80px;

Absolutely positioned div is centered

Code implementation:

border: 1px solid black;
position: absolute;
width: 200px;
height: 100px;
margin: 0 auto;
left: 0;
right: 0;

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