How to integrate domain pricing form in wordpress

[altious]

I try putting this code in my wordpress

 

<form action="http://www.mysite.com/domainchecker.php" method="post">
<input type="hidden" name="token" value="value" />
<input type="hidden" name="direct" value="true" />
Domain: <input type="text" name="domain" size="20" /> <select name="ext">
<option>.com</option>
<option>.net</option>
<option>.org</option>
<option>.biz</option>
<option>.info</option>
<option>.name</option>
<option>.us</option>
<option>.jp</option>
<option>.co.id</option>
</select>
<input type="submit" value="Go" />
</form>

 

but the form button always shows below the input form and not align properly

it works in html but not in wordpress.. anyone know who can fix this?