ass="row">
                <div class="col-md-3">
                    <div class="row">
                        <div class="col-md-4" id="domainArea">
                            <div class="card" style="width: 8rem">
                                <img class="card-img-top" src="/img/gateway.png">
                                <div class="card-body" id="center-gateway">
                                    <h5 class="card-title" style="text-align: center">center</h5>
                                    <h