how to align box in css code example

Example 1: 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! */

Example 2: css align center vertical and horizontal

.parent-class {
  display: flex;
  align-items: center;
  justify-content: space-around;
}

Example 3: how to horizontal center a div in css

#inner {
  width: 50%;
  margin: 0 auto;
}