Update show.html.erb

app/views/customers/show.html.erb

@@ -1,6 +1,6 @@
 <h1>Customer #<%= @customer.id %></h1> 
 <br/> 
-<h2>Details</h2>
+<h2>Details:</h2>
 <%= render :partial => 'customers/details', locals: {customer: @customer} %>
 <br/>
 <h2>Vehicles:</h2>