Answers for "how to center a div vertically and horizontally"

center a div in css

.container {
  display: flex;
  justify-content: center;
  align-items: center;
}

center div horizontally and vertically

.parent {
  position: relative;
}
.child {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

css center horizontally and vertically

.parent {
  position: relative;
}
.child {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

how to center a div vertically and horizontally

.container{	
	margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
  	width: /* Define the width here; */
    height: /* Define the height here; */
}

/*You have to define the width and height! */

css center vertically and horizontally

body {
	display: flex;
	min-height: 100vh;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}
/* to make "align-items: center" work: use "min-height: 100vh;"
100vh = 100% Viewport Height */

How to Center a Div Vertically and Horizontally

<div class="container">
  <div class="child"></div>
</div>

.container {
  ...
  position: relative;
}

.child {
  width: 50px;
  height: 50px;
  background-color: red;
  /* Center vertically and horizontally */
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -25px 0 0 -25px; /* apply negative top and left margins to truly center the element */
}