CSS - This is the code responsible for the centering of content

gistfile1.css

/* This is the code responsible for the centering of content */
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    
    -webkit-flex-pack:center;
	-webkit-justify-content:center;
	-moz-justify-content:center;
	-ms-flex-pack:center;
	justify-content:center;
    
    -webkit-flex-line-pack:center;
	-ms-flex-line-pack:center;
	-webkit-align-content:center;
	align-content:center;
    
    -webkit-flex-direction:column;
	-moz-flex-direction:column;
	-ms-flex-direction:column;
	flex-direction:column;
    
    text-align: center;
    width: 200px;
    height: 200px;