html - Position a div in the center of a page even if the width and height changes - 


<div style="height:100px;width:100px;border:1px solid black"></div>

how can position div in center?

.parent {   position: relative; }  .child {   width: 300px;   height: 100px;   padding: 20px;    position: absolute;   top: 50%;   left: 50%;    margin: -70px 0 0 -170px; }

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