*{
    box-sizing: border-box;   
}

body {
    background-image: url(../img/fondo_einstein.jpg);
}
div{
    width: 100%;
    display: flex;
    flex-wrap: wrap;

}
h1{

    background-image: url(../img/titulo.jpg);
    text-align: center;
    font-size: 3em;
    width: 100%;
    color: white;
}
img{
    margin: 20px auto;
    border: 14px solid gray;
}
p{
    width: 100%;
    text-align: justify;
    font-size: 1.3em;
    background-color: white;
}