app/views/shared/_map_legend_script.html.erb
<% content_for :legend do %>
<aside>
<table class='table'>
<tr>
<td class='key_image'><%= image_tag('marker.png', size:'22x22', alt:'Large map marker') %></td>
<td class='key_text'>Details updated within the last 12 months</td>
</tr>
<tr>
<td class='key_image'><%= image_tag('measle.png', size:'6x6', alt:'Small map marker') %></td>
<td class='key_text'>Details NOT updated within the last 12 months</td>
</tr>
</table>
</aside>
<% end %>