body{
    background:#3EA1FF url(../images/fondo.png) repeat;
    color: white;
}
header{
    color:black;
    background-color: white;
    opacity: 0.7;
    border-radius:20px;
    text-align:center;
    padding 30px;
    margin:20px;
}
#contenido{
    color:white;
    text-align: center;
    margin:40px 50px;
    
}
footer p{
    text-align: center;
    font-size:120%;

}