body{
    width: 100%;
    height: 100%;
}

#blockcentro{
    width: 50%;
    margin: 100px auto 0;
}

img{
    display: block;
    margin: 10px auto 10px;
    width: 100%;
}

h1{
    font-size: 1em;
    color: dimgrey;
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
}