/* Structure */
#main-content img {
    height: 200px;
}
table, th, td {
    border: 1px solid black;
}

/* Typography */
body {
    background-color: green;
    font-family: Arial, Helvetica, sans-serif;
}
#main-header h1, #main-content p, #main-content h2 {
    color: blue;
}