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public/index.html

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        <!-- GitLab Repository: Adaptive Tests Plugin -->
         <div class="col-lg-4 col-md-6 portfolio-item isotope-item filter-gitlab">
           <div class="portfolio-content h-100">
-            <img src="ausschreibung/img/gitlab.png" class="img-fluid" alt="Adaptive Tests Plugin">
+            <img src="ausschreibung/img/gitlab.PNG" class="img-fluid" alt="Adaptive Tests Plugin">
             <div class="portfolio-info">
               <h4>Moodle-Plugin: Adaptive Tests</h4>
               <p>Plugin-Code zur Unterstützung adaptiver Tests (Moodle 4.1)</p>
-              <a href="ausschreibung/img/gitlab.png" data-gallery="portfolio-gallery-gitlab" class="glightbox preview-link"><i class="bi bi-zoom-in"></i></a>
+              <a href="ausschreibung/img/gitlab.PNG" data-gallery="portfolio-gallery-gitlab" class="glightbox preview-link"><i class="bi bi-zoom-in"></i></a>
               <a href="https://transfer.hft-stuttgart.de/gitlab/knight/adaptivetests" class="details-link"><i class="bi bi-link-45deg"></i></a>
             </div>
           </div>