Update: updated all pages to new theme system

src/main/resources/templates/security/add-watermark.html

@@ -11,8 +11,11 @@
         <br><br>
         <div class="container">
           <div class="row justify-content-center">
-            <div class="col-md-6">
-              <h2 th:text="#{watermark.header}"></h2>
+            <div class="col-md-6" id="bg-card">
+              <div class="tool-header">
+                <span class="material-symbols-rounded tool-header-icon security">water_drop</span>
+                <span class="tool-header-text" th:text="#{watermark.header}"></span>
+              </div>
 
               <form method="post" enctype="multipart/form-data" action="api/v1/security/add-watermark">
                 <div class="mb-3">