added example header

static/style.css

@@ -115,6 +115,15 @@ body {
   padding: 40px;
 }
 
+/*Header*/
+header{
+  height: 300px;
+}
+header h1{
+  text-align: center;
+  padding-top: 100px
+}
+
 /* Headings 
 Überschrift 1:  4rem  svg     animated  2px   no hover
 Überschrift 2:  3rem  html    still     2px   hover

wiki/pages/example.html

@@ -15,6 +15,13 @@
 </nav>
 <!--End Sidebar Block -->
 {% endblock %}
+{% block header %} 
+<header style="background-image: url('https://static.igem.wiki/teams/5247/photos/university/pattern.svg');">
+  <div>
+    <h1>HEADER</h1>
+  </div>
+</header>
+{% endblock %}
 
 {% block page_content %}
 <!-- Start page content -->

wiki/pages/sources.html

@@ -6,4 +6,6 @@
 <div> Icons made by <a href="" title="Iconjam"> Iconjam </a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com'</a></div>
 <div> Icons made by <a href="https://www.freepik.com" title="Freepik"> Freepik </a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com'</a></div>
 <div> Icons made by <a href="https://www.freepik.com" title="Freepik"> Freepik </a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com'</a></div>
-<div> Icons made by <a href="https://www.flaticon.com/authors/elzicon" title="Elzicon"> Elzicon </a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com'</a></div>
\ No newline at end of file
+<div> Icons made by <a href="https://www.flaticon.com/authors/elzicon" title="Elzicon"> Elzicon </a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com'</a></div>
+<div> Icons made by <a href="https://www.freepik.com" title="Freepik"> Freepik </a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com'</a></div>
+<div> Icons made by <a href="https://www.freepik.com" title="Freepik"> Freepik </a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com'</a></div>
\ No newline at end of file