*{
    box-sizing: border-box;
}
body{
    background-image: url(../img/fondo_einstein.jpg);
    display: flex;
    flex-wrap: wrap;
}
h1{
    background-image: url(../img/titulo.jpg);
    size: 100%;
    text-align: center;
    color: white;
    width: 100%;

}

img{
    margin: 10px auto;
    margin-left: auto;
    margin-right: auto;
    border: 10px solid gray;
    
    
}
p{
    background-color: whitesmoke;
}