$database_connect = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_BASE);
$database_query = mysqli_query($database_connect, "SELECT * FROM `page_main`");
$database_result = mysqli_fetch_array($database_query);
<h2>– <?php echo $database_result['content']; ?></h2>
...
$database_query = mysqli_query($database_connect, "SELECT * FROM `page_main` WHERE ID = 1");
...