     if (e.value !== null) {
                                var v = e.value.toFixed(0);
                                var html = (`<span class="popupText">Height: ${v} meters</span><br/>`);
                                html += "<a href='#' onclick='styleGradient();'>gradient</a> | ";
                                html += "<a href='#' onclick='styleClasses();'>classes</a> | ";
                                html += "<a href='#' onclick='original();'>redGreen</a>";
                                var