Answers for "<div center"

centre div

<div class="container">
  <div class="child"></div>
</div>
.container {
  ...
  display: flex;
  justify-content: center;
  align-items: center;
}

how to center a div

.MyDiv{
  	display: block;
  	margin-left: auto;
	margin-right: auto;
}

div center

#inner {
  display: table;
  margin: 0 auto;
  border: 1px solid black;
}

#outer {
  border: 1px solid red;
  width:100%
}