Website: Add unique classes to buttons in the continue.partial.ejs (#20323)

Related to: #20227

Changes
- Added unique classes to buttons in the site-wide CTA.

website/views/partials/continue.partial.ejs

@@ -19,7 +19,7 @@
           <p>Let’s get you set up!</p>
         <% } %>
         <div>
-          <a purpose="continue-button" href="/start">
+          <a purpose="continue-button" class="start-cta-continue-button" href="/start">
             Continue
             <svg purpose="animated-arrow" xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 12 12">
               <path purpose="arrow-line" d="M1 6H9" stroke-width="2" stroke-linecap="round"/>
@@ -28,9 +28,9 @@
           </a>
         </div>
       </div>
-      <a purpose="continue-chevron" href="/start"> <img alt="continue" src="/images/chevron-core-fleet-black-7x12@2x.png"> </a>
+      <a purpose="continue-chevron" class="mobile-start-cta-continue-button" href="/start"> <img alt="continue" src="/images/chevron-core-fleet-black-7x12@2x.png"> </a>
       <div class="d-flex flex-column align-self-start">
-        <div purpose="banner-close-button">&times;</div>
+        <div purpose="banner-close-button" class="start-cta-close-button">&times;</div>
       </div>
     </div>