I received this MDB Bootstrap code.

Here is the link to the code: https://mdbootstrap.com/docs/standard/extended/login/#:~:text=EDIT%20IN%20SANDBOX-,Registration%20page,-Once%20again%2C%20the

<!-- Section: Design Block -->
<section class="background-radial-gradient overflow-hidden">
  <style>
    .background-radial-gradient {
      background-color: hsl(218, 41%, 15%);
      background-image: radial-gradient(650px circle at 0% 0%,
          hsl(218, 41%, 35%) 15%,
          hsl(218, 41%, 30%) 35%,
          hsl(218, 41%, 20%) 75%,
          hsl(218, 41%, 19%) 80%,
          transparent 100%),
        radial-gradient(1250px circle at 100% 100%,
          hsl(218, 41%, 45%) 15%,
          hsl(218, 41%, 30%) 35%,
          hsl(218, 41%, 20%) 75%,
          hsl(218, 41%, 19%) 80%,
          transparent 100%);
    }

    #radius-shape-1 {
      height: 220px;
      width: 220px;
      top: -60px;
      left: -130px;
      background: radial-gradient(#44006b, #ad1fff);
      overflow: hidden;
    }

    #radius-shape-2 {
      border-radius: 38% 62% 63% 37% / 70% 33% 67% 30%;
      bottom: -60px;
      right: -110px;
      width: 300px;
      height: 300px;
      background: radial-gradient(#44006b, #ad1fff);
      overflow: hidden;
    }

    .bg-glass {
      background-color: hsla(0, 0%, 100%, 0.9) !important;
      backdrop-filter: saturate(200%) blur(25px);
    }
  </style>

  <div class="container px-4 py-5 px-md-5 text-center text-lg-start my-5">
    <div class="row gx-lg-5 align-items-center mb-5">
      <div class="col-lg-6 mb-5 mb-lg-0" style="z-index: 10">
        <h1 class="my-5 display-5 fw-bold ls-tight" style="color: hsl(218, 81%, 95%)">
          The best offer <br />
          <span style="color: hsl(218, 81%, 75%)">for your business</span>
        </h1>
        <p class="mb-4 opacity-70" style="color: hsl(218, 81%, 85%)">
          Lorem ipsum dolor, sit amet consectetur adipisicing elit.
          Temporibus, expedita iusto veniam atque, magni tempora mollitia
          dolorum consequatur nulla, neque debitis eos reprehenderit quasi
          ab ipsum nisi dolorem modi. Quos?
        </p>
      </div>

      <div class="col-lg-6 mb-5 mb-lg-0 position-relative">
        <div id="radius-shape-1" class="position-absolute rounded-circle shadow-5-strong"></div>
        <div id="radius-shape-2" class="position-absolute shadow-5-strong"></div>

        <div class="card bg-glass">
          <div class="card-body px-4 py-5 px-md-5">
            <form>
              <!-- 2 column grid layout with text inputs for the first and last names -->
              <div class="row">
                <div class="col-md-6 mb-4">
                  <div class="form-outline">
                    <input type="text" id="form3Example1" class="form-control" />
                    <label class="form-label" for="form3Example1">First name</label>
                  </div>
                </div>
                <div class="col-md-6 mb-4">
                  <div class="form-outline">
                    <input type="text" id="form3Example2" class="form-control" />
                    <label class="form-label" for="form3Example2">Last name</label>
                  </div>
                </div>
              </div>

              <!-- Email input -->
              <div class="form-outline mb-4">
                <input type="email" id="form3Example3" class="form-control" />
                <label class="form-label" for="form3Example3">Email address</label>
              </div>

              <!-- Password input -->
              <div class="form-outline mb-4">
                <input type="password" id="form3Example4" class="form-control" />
                <label class="form-label" for="form3Example4">Password</label>
              </div>

              <!-- Checkbox -->
              <div class="form-check d-flex justify-content-center mb-4">
                <input class="form-check-input me-2" type="checkbox" value="" id="form2Example33" checked />
                <label class="form-check-label" for="form2Example33">
                  Subscribe to our newsletter
                </label>
              </div>

              <!-- Submit button -->
              <button type="submit" class="btn btn-primary btn-block mb-4">
                Sign up
              </button>

              <!-- Register buttons -->
              <div class="text-center">
                <p>or sign up with:</p>
                <button type="button" class="btn btn-link btn-floating mx-1">
                  <i class="fab fa-facebook-f"></i>
                </button>

                <button type="button" class="btn btn-link btn-floating mx-1">
                  <i class="fab fa-google"></i>
                </button>

                <button type="button" class="btn btn-link btn-floating mx-1">
                  <i class="fab fa-twitter"></i>
                </button>

                <button type="button" class="btn btn-link btn-floating mx-1">
                  <i class="fab fa-github"></i>
                </button>
              </div>
            </form>
          </div>
        </div>
      </div>
    </div>
  </div>
</section>
<!-- Section: Design Block -->

In the current form, when data is entered into the input fields, the placeholder returns to its original place even after entering the required fields! What the code should do is ensure that the placeholders do not come back to the normal place once the input fields are filled!