@import url(https://fonts.googleapis.com/css?family=Roboto:400,500,700,300,100);

html { 
  margin:0px;
  padding:0px;
  background: url("london.jpg") no-repeat center fixed; 
  -webkit-background-size: cover; /* pour anciens Chrome et Safari */
  background-size: cover; /* version standardisée */
}
h7 {
  
  font-family: "Roboto", helvetica, arial, sans-serif;
  font-size: 25px;
  font-weight: 400;
  text-rendering: optimizeLegibility;
  color:white;  
  text-shadow: #000000 1px 1px, #000000 -1px 1px, #000000 -1px -1px, #000000 1px -1px;
}