html {
  margin:0;
  padding:0;
  background: url(large.jpg) no-repeat center fixed;
  -webkit-background-size: cover; /* pour Chrome et Safari */
  -moz-background-size: cover; /* pour Firefox */
  -o-background-size: cover; /* pour Opera */
  background-size: cover; /* version standardisée */
}

  a:link {color: black;}
  a:visited {color: black;}
  a:hover {color: black;}
  a:active {color: black;}
  a:link{text-decoration:none}