Use constant height for page title.

src/routes/index.svelte

@@ -925,7 +925,7 @@
         </div>
       </div>
       <h1
-        class="font-bold my-5 text-2xl xl:text-3xl 2xl:text-4xl  text-gray-600"
+        class="font-bold h-10 my-5 text-2xl xl:text-3xl 2xl:text-4xl  text-gray-600"
       >
         Visualiser les cotis. & presta. sociales d'un cas type
       </h1>