메인홈페이지 herf?

<!doctype>
<html class="mainbackground">
<head>
        <link href="https://fonts.googleapis.com/css?family=Raleway" rel="stylesheet">
        <title>Web Coding</title>
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        <link rel="stylesheet" href="style.css">
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<body>
    <div class="main_board">
        <header class="main_header">
            <h2>DOR@HEE</h2>
        </header>

            <nav class="main_nav">
                <ul class="main_ul">
                    <a href="board.php"><li>게시판</li></a>
                </ul>
            </nav>
        <section class="main_content">
            <article class="main_article">
            </article>
            <aside class="main_aside">
                <?php echo $_SESSION['usernickname'];?>님 환영합니다<br />
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