The map-card css class appears to be missing in the latest version (4.7.1). The card does not collapse and the content is located below the card. I copied the example exactly as it appears in the mdb site and get an Unknown CSS class for the following in the IDE... map-card, map-container, button, living-coral, living-coral-text, table-borderless

<div class="card map-card" style="width: 22rem;">

        <!--Google map-->
        <div id="map-container-google-1" class="z-depth-1-half map-container" style="height: 500px">
            <iframe src="https://maps.google.com/maps?q=manhatan&t=&z=13&ie=UTF8&iwloc=&output=embed" frameborder="0"
                    style="border:0" allowfullscreen></iframe>
        </div>

    <!-- Card content -->
    <div class="card-body closed px-0">

        <div class="button px-2 mt-3">
            <a class="btn-floating btn-lg living-coral float-right"><i class="fas fa-bicycle"></i></a>
        </div>

        <div class="white px-4 pb-4 pt-3-5">

            <!-- Title -->
            <h5 class="card-title h5 living-coral-text">Central Park Zoo</h5>

            <div class="d-flex justify-content-between living-coral-text">
                <h6 class="card-subtitle font-weight-light">A place to relax</h6>
                <h6 class="font-small font-weight-light mt-n1">25 min</h6>
            </div>

            <hr>

            <div class="d-flex justify-content-between pt-2 mt-1 text-center text-uppercase living-coral-text">
                <div>
                    <i class="fas fa-phone fa-lg mb-3"></i>
                    <p class="mb-0">Call</p>
                </div>
                <div>
                    <i class="fas fa-cat fa-lg mb-3"></i>
                    <p class="mb-0">Love</p>
                </div>
                <div>
                    <i class="far fa-grin-beam-sweat fa-lg mb-3"></i>
                    <p class="mb-0">Smile</p>
                </div>
            </div>

            <hr>

            <table class="table table-borderless">
                <tbody>
                    <tr>
                        <th scope="row" class="px-0 pb-3 pt-2">
                            <i class="fas fa-map-marker-alt living-coral-text"></i>
                        </th>
                        <td class="pb-3 pt-2">East 64th Street, New York, NY 10021, US</td>
                    </tr>
                    <tr class="mt-2">
                        <th scope="row" class="px-0 pb-3 pt-2">
                            <i class="far fa-clock living-coral-text"></i>
                        </th>
                        <td class="pb-3 pt-2"><span class="deep-purple-text mr-2"> Closed</span> Opens 10 AM</td>
                    </tr>
                    <tr class="mt-2">
                        <th scope="row" class="px-0 pb-3 pt-2">
                            <i class="fas fa-cloud-moon living-coral-text"></i>
                        </th>
                        <td class="pb-3 pt-2">Sunny weather tommorow</td>
                    </tr>
                </tbody>
            </table>

        </div>

    </div>

</div>
<!-- Card -->

All the other extended cards are working.