body {
  background:url(fondo1.jpg) center fixed;
  background-size:100% 100%;
}

      #cont{
      	display:block;
        margin:0 auto 0;
        background-color:skyblue; 
        border-radius:10px;
        position:relative;
        width:400px;
        height:550px;

      }

    
    #bot{
    display:block;
    margin:0 auto 0;  
    position:relative;
    width:150px;
    height:50px; 
}

#volver{
         display:block;
         margin:0 auto 0;
         position:relative;
         border-color:black;
         width:150px;
         height:50px;

      }

#al{

 display:block;
 margin:0 auto 0;
 position:center;
 width:450px;
 height:50px;
}

#botones{
	display:block;
    margin:0 auto 0;
	background-color:skyblue; 
    border-radius:10px;
    position:relative;
    width:200px;
    height:250px;
}


.alertify.alert {
    background: red;
}

 @media all and (max-width:500px){

    #cont{
      	display:block;
        margin:0 auto 0;
        background-color:skyblue; 
        border-radius:10px;
        position:relative;
        width:220px;
        height:560px;

      }

      #al{
        display:block;
        margin:0 auto 0;
        position:relative;
        width:220px;
        height:85px;
      }



 }