CSR-227 update header font size.

src/common-components/funnel-sub-header/funnel-sub-header.vue

@@ -1,7 +1,7 @@
 <template>
   <div class="current_car_info-text">
     <div class="d-flex align-items-center justify-content-center container-fluid overflow-hidden">
-      <h2 class="text-center fs-5 d-block fw-normal mb-0">
+      <h5 class="text-center fw-normal mb-0">
         <span>
           {{ text }}
         </span>
@@ -9,7 +9,7 @@
         v-if="hasBackButton"
         :backButtonAction="backButtonAction"
       />
-      </h2>
+    </h5>
     </div>
   </div>
 </template>
@@ -33,7 +33,7 @@ export default {
 </script>
 
 <style lang="scss">
-  h2 {
+  h5 {
     color: $gray-550;
 
     button {