Warning: Undefined array key "name" in C:\Users\navig\OneDrive\Рабочий стол\Frontend\api.php on line 2 и так по line 4 and 6

<?php
$name = filter_var(trim($_POST['name']),
FILTER_SANITIZE_STRING);
$email = filter_var(trim($_POST['Email']),
    FILTER_SANITIZE_STRING);
$password = filter_var(trim($_POST['password']),
    FILTER_SANITIZE_STRING);

if(mb_strlen($name) < 3 || mb_strlen($name) > 50) {
    echo "name password";
    exit();
}
if(mb_strlen($email) < 5 || mb_strlen($email) > 40) {
    echo "name password";
    exit();
}
if(mb_strlen($password) < 5 || mb_strlen($password) > 50) {
    echo "2 to 6 characters";
    exit();
}

$mysql = new mysqli("Register-log", "root", "", "Register-log");
$mysql->query('INSERT INTO `users` (name, email, password)
VALUES($name,$email $password)');

//закрытие БД
$mysql->close();
?>
html 

 <!--  forma входа-->
                    <div class="form-box">
                      <form action="api.php" class="form form_signin" method="post">
                        <h3 class="form__title">sign in</h3>

                        <p>
                          <input type="text" class="form__input" placeholder="name">
                        </p>
                        <p>
                          <input type="password" class="form__input" placeholder="password">
                        </p>
                        <p>
                          <button class="form__btn send-button">sign in</button>
                        </p>
                        <p>
                          <a href="#" class="form__fogot">restore password</a>
                        </p>
                      </form>

                      <!-- Block регистрация -->

                      <form action="api.php" class="form form_signup" method="post">
                        <h3 class="form__title">Registration</h3>

                        <p>
                          <input type="text" class="form__input" placeholder="name">
                        </p>
                        <p>
                          <input type="email" class="form__input" placeholder="Email">
                        </p>
                        <p>
                          <input type="password" class="form__input" placeholder="password">
                        </p>
                        <p>
                          <button class="form__btn form__btn_signup send-button">Registration</button>
                        </p>

                      </form>
                    </div>
                  </article>