MDB PRO Text field label not moving

MDB form label doesn't "float up"

Form label stays static when interacted with

Any help appreciated, tia

Just using the basic MDB PRO login code:

    <!-- Material form login -->
<div class="card">

  <h5 class="card-header info-color white-text text-center py-6">
    <strong>Sign in</strong>
  </h5>

  <!--Card content-->
  <div class="card-body px-lg-7 pt-0">

    <!-- Form -->
    <form class="text-center" style="color: #757575;" action="#!">

      <!-- Email -->
      <div class="md-form">
        <input type="email" id="materialLoginFormEmail" class="form-control">
        <label for="materialLoginFormEmail">E-mail</label>
      </div>

      <!-- Password -->
      <div class="md-form">
        <input type="password" id="materialLoginFormPassword" class="form-control">
        <label for="materialLoginFormPassword">Password</label>
      </div>

      <div class="d-flex justify-content-around">
        <div>
          <!-- Remember me -->
          <div class="form-check">
            <input type="checkbox" class="form-check-input" id="materialLoginFormRemember">
            <label class="form-check-label" for="materialLoginFormRemember">Remember me</label>
          </div>
        </div>
        <div>
          <!-- Forgot password -->
          <a href="">Forgot password?</a>
        </div>
      </div>

      <!-- Sign in button -->
      <button class="btn btn-outline-info btn-rounded btn-block my-4 waves-effect z-depth-0" type="submit">Sign in</button>

      <!-- Register -->
      <p>Not a member?
        <a href="">Register</a>
      </p>

      <!-- Social login -->
      <p>or sign in with:</p>
      <a type="button" class="btn-floating btn-fb btn-sm">
        <i class="fab fa-facebook-f"></i>
      </a>
      <a type="button" class="btn-floating btn-tw btn-sm">
        <i class="fab fa-twitter"></i>
      </a>
      <a type="button" class="btn-floating btn-li btn-sm">
        <i class="fab fa-linkedin-in"></i>
      </a>
      <a type="button" class="btn-floating btn-git btn-sm">
        <i class="fab fa-github"></i>
      </a>

    </form>
    <!-- Form -->

  </div>

</div>
<!-- Material form login -->