Define offset only for md layout (following)

Fix #160 for following list

resources/views/profile/following.blade.php

@@ -42,7 +42,7 @@
     </div>
   </div>
 
-  <div class="col-12 col-md-8 offset-2">
+  <div class="col-12 col-md-8 offset-md-2">
     @if($following->count() !== 0)
     <ul class="list-group mt-4">
       @foreach($following as $user)