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HTML

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HTML

              
                <div class="container">
  <div class="text-expander">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus orci lorem, ullamcorper in suscipit vel, rhoncus at erat. Nam ultrices mollis orci, et pretium arcu consectetur eget. Integer elementum nibh justo. Nullam ullamcorper semper ornare. Nulla sed lectus est, vel iaculis dui. Duis consequat placerat tortor, eget iaculis est iaculis eget. In eu justo nisi. Cras cursus ligula eu erat tincidunt accumsan. Morbi vitae pharetra lacus. Curabitur ultricies dolor a tellus imperdiet at volutpat risus tristique. Praesent eget faucibus elit. Integer sed volutpat diam. Nunc ut lorem non tellus gravida iaculis. Curabitur consequat, magna eget imperdiet vestibulum, neque elit rhoncus sem, sit amet lacinia est nulla id purus. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Vivamus non diam eget nulla interdum varius.
    In dictum adipiscing odio ut consectetur. Praesent nec libero vitae ligula suscipit varius eu lobortis ligula. Mauris commodo diam nec tortor congue placerat. Aliquam ultricies, erat et porttitor convallis, mauris justo ultrices orci, sit amet ullamcorper tortor libero ac eros. Nulla sed justo tellus. Donec imperdiet turpis id sem placerat semper. Sed varius vestibulum ligula, quis pharetra leo auctor non. Praesent adipiscing metus sodales justo dictum vel volutpat mi rutrum. Quisque sed eros eget est porta mollis a nec nibh. Aliquam erat volutpat. Sed imperdiet urna tincidunt erat consectetur in aliquam metus elementum.
  </div>
  <div class="btn-text-expander">Read more</div>
</div>
              
            
!

CSS

              
                /* only for demo */
.container {
  font-family: 'Courier New', monospace;
  padding-top: 40px;
  max-width: 400px;
  margin: 0 auto;
}
.btn-text-expander {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 14px;
  border-radius: 3px;
  background-color: #665aef;
  color: #fff;
} 

/* code */
.text-expander {
  height: 70px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
}
.text-expander.active {
  display: inherit;
  height: auto;
}
              
            
!

JS

              
                $('.btn-text-expander').on('click', function() {
  var button_text = ($('.text-expander').hasClass('active')) ? 'Read more' :'Read less';
  $(this).text(button_text).prev('.text-expander').toggleClass('active');
});
              
            
!
999px

Console