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body, html {
  height: 100%;
  margin: 0;
}

.bg {
  /* The image used */
  background-image: url("img_girl.jpg");

  /* Full height */
  height: 100%; 

  /* Center and scale the image nicely */
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}
</style>
</head>
<body>

<div class="bg"></div>