html,body{margin:0;height:100%;overflow:hidden;background:#000}
 div.cont{
 display:block;
 position:relative;
	 width:98%;
  height:calc(98% - 10px);
  margin:10px auto;
 }
  #cnv{
  display:block;
  position:relative;
  width:100%;
  height:100%;
  
  border:1px solid transparent;
  }
  .nava{
	  position:absolute;
	  z-index:1;
	  top:10px;
	  left:10px;
	  display:inline-block;
  }