HTML Button not working within Sharepoint

I'm creating a website and adding as a webpart to a sharepoint site. Everything is going ok except for the buttons i created are not working. They are working in IE when i open the html file but when i open it from within the webpart it doesnt work.

The css styling aspect of the button works, but the isnt working. It doesnt direct me to the the url.

 <a href="http:###">
    <button style="float: left; position: relative; border-style: solid; height:40px; padding-right:0px;margin-top:-10px; margin-left:56px; width:180px; font-size: 1.2em;"
        type="button">###</button></td>

Any help?