#blog{   
    padding: 90px 10px 80px 10px; 
    background:url(../img/pa.jpg);
    background-attachment: fixed;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: 50% 50%;
}

#blog h2{
    text-align: center;
    color:#35478C;
    font-weight: bold;
}
#blog h3, h4{
	text-align: center;
    color:#000; 
}
#blog .contenedor{
	display: flex;
	justify-content: center;
	flex-wrap: wrap;
}

#blog article{
	margin:10px;
    background: #fff;
    box-shadow: 0 0 0 0px #333,
                0 15px 50px;
}

#blog img{
	width: 100%;
	max-width: 205px;
}