Simple form with labels…

<form action="/login" method="POST">
    
    <label for="username">Username:</label>
    <input id="username" type="text" name="username" />

    <label for="pass">Password:</label>
    <input id="pass" type="password" name="pass" />

    <input type="submit" name="submit" />

</form>

<form id="my-form" action="/login" method="POST">
    
    <input id="username" type="text" name="username" />

    <label for="pass">Password:</label>
    <input id="pass" type="password" name="pass" />

    <input type="submit" name="submit" />

</form>

<label for="username" form="my-form">Username:</label>