[fix] do not use h1 element for the logo

searx/templates/oscar/index.html

@@ -6,10 +6,10 @@
             {% if cookies['oscar-style'] == 'pointhi' %}
                 <h1 class="text-hide center-block"><img class="center-block img-responsive" src="{{ url_for('static', filename='img/searx_logo.png') }}" alt="searx logo"/>searx</h1>
             {% else %}
-                <h1 class="text-hide center-block" id="main-logo">
+                <div class="text-hide center-block" id="main-logo">
                     <img class="center-block img-responsive" src="{{ url_for('static', filename='img/logo_searx_a.png') }}" alt="searx logo" />
                     searx
-                </h1>
+                </div>
             {% endif %}
         </div>
     </div>