anchor.diff:        <div class="panel-body">
           <h4>Group name</h4>
           <p>
  -          <small class="muted">4 members</small>
  -          <small class="muted">12 posts</small>
  +          <small class="text-muted">4 members</small>
  +          <small class="text-muted">12 posts</small>
           </p>
           <div class="text-center">
             <a class="btn btn-danger btn-block" href="#">Leave</a>
  
positive.code:       <div class="panel-body">
          <h4>Group name</h4>
          <p>
            <small class="muted">4 members</small>
            <small class="muted">12 posts</small>
          </p>
          <div class="text-center">
            <a class="btn btn-default btn-block" href="#">Join</a>
  
negative.code:       <div class="panel-body">
          <h4>Group name</h4>
          <p>
            <small class="text-muted">4 members</small>
            <small class="text-muted">12 posts</small>
          </p>
          <div class="text-center">
            <a class="btn btn-default btn-block" href="#">Join</a>
  