https://getbootstrap.com/

http://blog.marko-kastelec.com/2015/09/14/how-to-detect-users-device-size-xs-sm-md-or-lg-using-bootstrap/

• smart phone = xs
• ipad = md
• computer = lg

http://stackoverflow.com/questions/14441456/how-to-detect-which-device-view-youre-on-using-twitter-bootstrap-api