*{
    box-sizing: border-box;
}

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

h1{
    background-image: url(../img/titulo.jpg);
    color: white;
    text-align: center;
    font-size: 3em;
    width: 100%;
}

p{
    background-color: white;
}

img{
    margin: 10px auto;
    border: 5px solid gray;
}