<div class="pure-u-1-2">
              <div class="simple-padding">
                NES System Palette
              </div>
              <div class="NES-palette simple-padding">
                <% nesidxrows.forEach((nesidxgroups) => { %>
                <div class="pure-g">
                  <% nesidxgroups.forEach((nesidxset) => { %>
                  <div class="pure-u-1-4"> 
                    <div class="pure-g">
                      <% nesidxset.forEach((nesidx) => { %>
                      <div class="pure-u-1-4"><button class="pure-button" nesidx="<%= nesidx %>"><%= nesidx %></button></div>
                      <% }); %>
                    </div>
                  </div>
                  <% }); %>
                </div>
                <% }); %>
              </div>
            </div>