You are trying to wrap a form into a paragraph <p>
which is kinda invalid.
This should be wrapped into a div
element.
<div class="logform">
<form action="http://www.link.com" method="post">
username: <input type="username" name="username"><br>
password: <input type="password" name="passw"><br>
<input type="submit">
</form>
</div>