[html] How to add margin right to table

I have following html:

<table width="100%;>
        <tr><hr style="width:100%;"></hr></tr>
        <tr>
            <span style="float:left">abc</span>
            <span class="noindex" style="float:right">PageID</span>
        </tr>
        <br/>
        <tr>Some text here...</tr>
</table>

I want to add 100px margin from right of the screen. i tried adding margin-right and removing width =100% it is not working.