<div class="container-flex">
   <img class="avatar avatar-lg-size image-responsive"   src="/assets/avatar.jpg" alt="lg-avatar">
   <img class="avatar avatar-md-size image-responsive"  src="/assets/avatar.jpg" alt="md-avatar">
   <img class="avatar avatar-sm-size image-responsive"  src="/assets/avatar.jpg" alt="sm-avatar">
   <img class="avatar avatar-xs-size image-responsive"  src="/assets/avatar.jpg" alt="xs-avatar">
</div>