jinja for static folder

templates/main.html

@@ -108,7 +108,7 @@
             </div>
             <div class="col-lg-2 col-6 d-inlign-flex">
               <p class="text-center align-self-center">
-                <img loading="lazy" src="./../../static/BMBF_gefoerdert_2017_en.jpg" alt="Funded by BMBF" style="max-height:100px">
+	      <img loading="lazy" src="{{ url_for('static', filename='BMBF_gefoerdert_2017_en.jpg') }}" alt="Funded by BMBF" style="max-height:100px">
               </p>
             </div>
             <div class="col-lg-5 col-12 d-inlign-flex">