tidy up block display a little more

longs/templates/longs/long_display_block.html

@@ -13,13 +13,16 @@
         {% for series in question.series.all %}
         <span class="series-block">
             <span>
-                Series {{ forloop.counter }}:
+                <span class="series-block-series-number">Series {{ forloop.counter }}:</span>
                 <a href="{% url 'longs:long_series_detail' pk=series.pk %}">
                     {{series.get_block}}
                 </a>
 
+                <br>
+                <span class="series-block-popup-link">
                 <a href="#"
                     onclick="return window.create_popup_window('/longs/series/{{series.pk}}', 'Series')">Popup</a>
+                </span>
             </span>
         </span>
         {% endfor %}