Add error indication

app/views/form/_validation_override_question.html.erb

@@ -1,4 +1,5 @@
-<%= f.govuk_check_boxes_fieldset :override_net_income_validation,
+<div class="govuk-form-group govuk-form-group--error">
+  <%= f.govuk_check_boxes_fieldset :override_net_income_validation,
       legend: { text: @case_log.soft_errors.values.first.message, size: "l" },
       hint: { text: @case_log.soft_errors.values.first.hint_text } do %>
 
@@ -6,4 +7,5 @@
         label: { text: "Yes" },
         checked: f.object.send("override_net_income_validation")
       %>
-<% end %>
+  <% end %>
+</div>

spec/features/case_log_spec.rb

@@ -388,7 +388,7 @@ RSpec.describe "Test Features" do
         fill_in("case-log-net-income-field", with: income_over_soft_limit)
         choose("case-log-net-income-frequency-weekly-field", allow_label_click: true)
         click_button("Save and continue")
-        expect(page).to have_content("For net incomes that fall outside the expected range you must confirm they're correct")
+        expect(page).to have_content("Are you sure this is correct?")
         check("case-log-override-net-income-validation-override-net-income-validation-field", allow_label_click: true)
         click_button("Save and continue")
         expect(page).to have_current_path("/case_logs/#{case_log.id}/net_income_uc_proportion")
@@ -414,7 +414,7 @@ RSpec.describe "Test Features" do
         fill_in("case-log-net-income-field", with: income_under_soft_limit)
         click_button("Save and continue")
         click_link(text: "Back")
-        expect(page).not_to have_content("For net incomes that fall outside the expected range you must confirm they're correct")
+        expect(page).not_to have_content("Are you sure this is correct?")
       end
     end
   end