/*
 * Base structure
 */

html,
body {
/*css for full size background image*/
  background: url('../imagens/avertis_background.jpg') no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  
  height: 100%;
  text-align: center;
  text-shadow: 0 1px 3px rgba(0,0,0,.5);
 
}

@media (min-width: 400px) {
  html,
  body {
  /*css for full size background image*/
    background: url('../imagens/avertis_background.jpg') no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    
    width: 20%;
    text-align: center;
    text-shadow: 0 1px 3px rgba(0,0,0,.5);
   
  }
}