Username and password boxes on top of an image at a precise location

<form action="action_page.php">

  <pre><div class="container">
    <label for="uname">Username</label>
    <input type="text" placeholder="Enter Username" name="uname" required>

    <label for="psw">Password</label>
    <input type="password" placeholder="Enter Password" name="psw" required>

    <button type="submit">Login</button>
   
  </div>


</form>

<style>
* {
 margin: 0;
 padding: 0;
}
.imgbox {
 display: grid;
 height: 100%;
}
.center-fit {
 max-width: 100%;
 max-height: 100vh;
 margin: auto;
}

<div class="imgbox">

</div>