Fix custom modal css to align it at center independent of device

Co-authored-by: enzoggqs <eggqsaraiva@gmail.com>

src/components/QrCodeComponent.vue

@@ -154,6 +154,11 @@ const validatePix = async (): Promise<void> => {
         @button-clicked="emit('pixValidated', e2eId)"
       />
     </div>
+    <CustomModal
+      v-if="showModal"
+      @close-modal="showModal = false"
+      :isRedirectModal="false"
+    />
   </div>
 </template>