body {
    background-color: #ececec;
    /* easier on eyes than white */
    font-family: sans-serif;
}

p { text-align: justify; }

h1, h2, h3, h4, h5 {
    text-align: center;
    padding-top: 0.5em;
    margin-bottom: -0.5em;
}

img {
    width: 100%;
    max-width: 800px;
}