html ,body{
	 height:100%;
     width:100%;
     margin: 0px;
}

.contenedor {
 
     background: url(../img/hossana.jpg) no-repeat fixed center;
   -webkit-background-size: cover;
   -moz-background-size: cover;
   -o-background-size: cover;
   background-size: cover;
   height: 100%;
   width: 100% ;
   text-align: center;
 
}

.btn { 
position: absolute;
color: #00CCFF; 
font-family: 'Opens Sans',helvetica; 
font-size: 20px; 
font-weight: bold; 
text-decoration: none; 
top: 5%;
left:80%;
}