body {

background-color: #f2f2f2;

margin: 0;

padding: 0;

.container {

width: 800px;

height: 600px;

margin: 0 auto;

display: flex;

justify-content: center;

align-items: center;

.content {

width: 800px;

height: 600px;

background-color: #fff;

margin: 0 auto;

padding: 200px;