Untitled

html:
<!DOCTYPE html>
<html>
<head>
<title> Doctor Who FanSite </title>
<link  href="new1.css" rel="stylesheet" type="text/css">
</head>
<body class="bg">
<h1 id="dr"> Doctor Who </h1>
    </body>
	</html>
Si CSS:

.bg {
  background: url("tenor.gif");
  height: 100%;
  background-position: center;
  background-repeat: no-repeat;
  background-size:cover;
  width:100%;
  height:100%;

}
#dr{

color:blue;
text-align:center;

}