Answers for "align element center of page"

center a div in css

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

how to put container in center of page

#container
{
    width: 400px;
    margin-left: auto;
    margin-right: auto;
}

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! */