body{
    background-image: url(./img/fondo_einstein.jpg);
}

header{
    width: 100%;
    color: white;
    font-size: 3em;
    text-align: center;
    text-transform: capitalize;
    background-image: url(./img/titulo.jpg);
    
}

img{
    width: 18%;
    margin: 35px 40%;
    border: 10px solid gray;  
}

article{
    background-color: white;
    width: 100%;
    padding: 0px;
    font-size: 1.1em;
}