body{     background:url('http://www.catedraocampo.com.ar/vn24/3/img/fondorayas.jpg');
    color: white
    
    }

header{ 
    background-color: black;
    margin-right: 4rem;
    margin-left: 4rem;
    padding: 1rem;
    margin-top: -1rem;
    
     }

.nombre{
background:url('http://www.catedraocampo.com.ar/vn24/3/img/fondonombre.jpg');
    margin-right: 4rem;
    margin-left: 4rem;
    margin-top: -1rem;
    padding: 1rem
}

        
.cuadro { 
    background-color: #0489B1;
    margin-right: 4rem;
    margin-left: 4rem;  
    margin-top: -1.4rem;
    color: white;
    padding: 1rem;
}