Uniformize style with hr

submissions/templates/submissions/referee_guidelines.html

@@ -66,6 +66,7 @@
 
 </div>
 
+<hr>
 <h2 class="highlight" id="forReferees">For referees</h2>
 
 <div class="row">
@@ -312,7 +313,7 @@
 
 </div>
 
-
+<hr>
 <h2 class="highlight" id="forAuthors">For authors</h2>
 
 <div class="row">