Add linkback to Orion library

Change-Id: I36f019fe14d9d9d08070522be95faa8c2091ffff
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
diff --git a/css/style.css b/css/style.css
index 4f35935..70691d5 100644
--- a/css/style.css
+++ b/css/style.css
@@ -781,6 +781,11 @@
 .blogger .fa-fw {
    text-align: left;
 }
+
+a.linkback{
+	color: #dedede;
+	font-size: 10px;
+}
 	
 /* ------- Resources Page ------*/
 
diff --git a/sirius-web.html b/sirius-web.html
index 62d90af..709ebe2 100644
--- a/sirius-web.html
+++ b/sirius-web.html
@@ -203,13 +203,13 @@
 			<p>Obeo provides a private instance that allows you to try <b>Sirius Web</b>'s features.</p>
 			<p>It also enables you to experience <b>additional features</b> coming with <b><a href="https://www.obeo.fr/en/products/ocp-modeler">Obeo Cloud Platform</a></b>:<br>users management, teams, public/private projects, notifications of currently active users, ...</p>
 			<p>&nbsp;</p>
-
 			<p><a class="btn" href="https://www.obeocloudplatform-demo.com/signup">Register</a></p>
-
 		</header>
+		<p class="centered"><a class="linkback" href="https://orioniconlibrary.com" target="_blank">Icons by Orion Icon Library</a></p> 
 	</article>
 </section>
 
+
 <ng-include src="'angular/blocks/footer.html'"></ng-include>
 <ng-include src="'angular/blocks/call2action.html'"></ng-include>