html {
    font-family: sans-serif;
}

header {
    font-weight: bold;
    text-align: center;
}

article {
    margin: 2% auto;
    width: 80%;
    border-style: solid;
    border-width: 1px;
    border-radius: 3px;
    padding: 1%;
    background: lightgray;
}

article div.content {
    text-align: justify;
    font-size: 0.9em;
}

article img {
    max-width: 100%;
}

footer {
    width: 100%;
    text-align: center;
    font-size: 0.7em;
    font-weight: bold;
    position: fixed;
    bottom: 5px;
}