CSS 不起作用,该怎么解决

CSS 不起作用
有些css不起作用，难道是跟php有关？
php部分：

PHP code

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if($auth==true)
{
    echo "<tr>";
    echo "<td class='block_link' id='block_link'><div style='width:100%; overflow:hidden; text-align:left; font-size:8.5pt;'>You have</div><div style='width:100%; overflow:hidden; text-align:right; font-size:27.5pt;'>\$$credit</div></td>";
    echo "<td class='block_link'><a href='user_center.php'>Start Order</a></td>";
    echo "<td class='block_link'><a href='user_center.php'>View Order</a></td>";
    echo "<td class='block_link'><a href='user_cp.php'>Edit Profile</a></td>";
    echo "<td class='block_link'><a href='user_cp.php'>Change Password</a></td>";
    echo "<td class='block_link'><a href='recharge.php'>Recharge My Account</a></td>";
    echo "<td class='block_link'><a href='logout.php'>Logout</a></td>";
    echo "</tr>";
}

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CSS code

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.block_link a
{
    width:120px;
    height:50px;
    display: block;

    background-color:#f1f1f1;
    text-align:center;
    font-size:10.5pt;
    text_decoration:none; //去链接下划线不起作用
    padding-top:30px;
}

.block_link a:link, block_link a:visited  //这里的a:visited 也不起作用
{
    background-color: #f1f1f1;
    text_decoration:none; //去链接下划线不起作用
    color:#009EDD;
}

.block_link a:hover
{
    background-color: #009EDD;
    text_decoration:none; //去链接下划线不起作用
    color:#ffffff;
}

#block_link
{
    background-color:#d34836;
    color:#ffffff;
    width:120px;
}

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