Input type submit button not centered

<div class="centerEverything">
    <form id="loginForm" method="POST" action="../login.js">
        <label for="email">
            <input type="email" name="email" id="loginEmail" placeholder="Email" required><br>
        </label>
        <label for="password">
            <input type="password" name="password" id="loginPassword" placeholder="Password"...