How to center a checkbox in a table cell?

The cell contains nothing but a checkbox. It is rather wide because of text in the table header row. How do I center the checkbox (with inline CSS in my HTML? (I know))

I tried

 <td>
      <input type="checkbox" name="myTextEditBox" value="checked" 
      style="margin-left:auto; margin-right:auto;">
 </td>

but that didn't work. What am I doing wrong?


Update: here's a test page. Can someone please correct it - with CSS inline in the HTML - so that the checkboxes are centered in their columns?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Alignment test</title>
</head>
<body>

<table style="empty-cells:hide; margin-left:auto; margin-right:auto;" border="1"   cellpadding="1" cellspacing="1">

  <tr>
    <th>Search?</th><th>Field</th><th colspan="2">Search criteria</th><th>Include in report?<br></th>
  </tr>

  <tr>
    <td>
        <input type="checkbox" name="query_myTextEditBox" style="text-align:center; vertical-align: middle;">    
    </td>

    <td>
      myTextEditBox
    </td>

    <td>
       <select size ="1" name="myTextEditBox_compare_operator">
        <option value="=">equals</option>
        <option value="<>">does not equal</option>
       </select>
    </td>

    <td>
      <input type="text" name="myTextEditBox_compare_value">
    </td>

    <td>
      <input type="checkbox" name="report_myTextEditBox" value="checked" style="text-align:center; vertical-align: middle;">
    </td>

  </tr>

</table>


</body>
</html>

I have accepted @Hristo's answer - and here it is with inline formatting ...

<table style="empty-cells:hide;" border="1"   cellpadding="1" cellspacing="1">

    <tr>
        <th>Search?</th><th>Field</th><th colspan="2">Search criteria</th><th>Include in report?<br></th>
    </tr>

    <tr>
        <td style="text-align: center; vertical-align: middle;">
            <input type="checkbox" name="query_myTextEditBox">    
        </td>

        <td>
            myTextEditBox
        </td>

        <td>
            <select size ="1" name="myTextEditBox_compare_operator">
                <option value="=">equals</option>
                <option value="<>">does not equal</option>
            </select>
        </td>

        <td>
            <input type="text" name="myTextEditBox_compare_value">
        </td>

        <td style="text-align: center; vertical-align: middle;">
            <input type="checkbox" name="report_myTextEditBox" value="checked">
        </td>

    </tr>

</table>

Solution 1:

How about this... http://jsfiddle.net/gSaPb/


Check out my example on jsFiddle: http://jsfiddle.net/QzPGu. Code snippet:

td {
  text-align: center;
  /* center checkbox horizontally */
  vertical-align: middle;
  /* center checkbox vertically */
}

table {
  border: 1px solid;
  width: 200px;
}

tr {
  height: 80px;
}
<table>
  <tr>
    <td>
      <input type="checkbox" name="myTextEditBox" value="checked" /> checkbox
    </td>
  </tr>
</table>

Solution 2:

Try

<td style="text-align:center;">
  <input type="checkbox" name="myTextEditBox" value="checked" />
</td>

Solution 3:

Try this, this should work,

td input[type="checkbox"] {
    float: left;
    margin: 0 auto;
    width: 100%;
}