anchor.diff:      hr
       .row
           .col-xs-12.col-sm-10.col-sm-offset-1.col-md-8.col-md-offset-2.text-center
  -            img.img-responsive.img-center(src='//i.imgur.com/BTtb8P0g.jpg')
  +            a(href="//m.do.co/c/ba8a71773373" target='_blank' onClick="ga('send', 'event', 'Shop', 'clicked', '$10 Digital Ocean credit');")
  +              img.img-responsive.img-center(src='//i.imgur.com/BTtb8P0g.jpg')
               h3 Get $10 in credit for your own Digital Ocean server
               p Digital Ocean gives our community $25 in credit after you spend $25.
               a.btn.btn-cta.signup-btn.btn-block(href="//m.do.co/c/ba8a71773373" target='_blank' onClick="ga('send', 'event', 'Shop', 'clicked', '$10 Digital Ocean credit');") Claim your $10 credit
  
positive.code:     hr
      .row
          .col-xs-12.col-sm-10.col-sm-offset-1.col-md-8.col-md-offset-2.text-center
              img.img-responsive.img-center(src='http://i.imgur.com/YqZqTN6g.jpg')
              h3 Buy some affordable domain names
              p Namecheap gives our community a 15% commission on your first purchase.
              a.btn.btn-cta.signup-btn.btn-block(href="//www.namecheap.com/?aff=102130" onClick="ga('send', 'event', 'Shop', 'clicked', 'Namecheap domain');") Get your domain name
  
negative.code:             h2 Books our community recommends
              p Amazon gives our community a commission if you make a purchase right after clicking one of these buttons.
              .spacer
              a(href="//www.amazon.com/gp/product/0984782850/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0984782850&linkCode=as2&tag=out0b4b-20&linkId=41b9f338b2a1a8ba00d67f944f68a982" onClick="ga('send', 'event', 'Shop', 'clicked', 'Cracking the Coding Interview');" target='_blank')
                img.img-responsive.img-center(src='//i.imgur.com/hV9F2bo.jpg' alt='Cracking the Coding Interivew book cover')
              .button-spacer
              a.btn.signup-btn.btn-cta(href="//www.amazon.com/gp/product/0984782850/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0984782850&linkCode=as2&tag=out0b4b-20&linkId=41b9f338b2a1a8ba00d67f944f68a982" onClick="ga('send', 'event', 'Shop', 'clicked', 'Cracking the Coding Interview');" target='_blank') Get it on Amazon
              .spacer
              hr
              .spacer
              a(href="//www.amazon.com/gp/product/0596805527/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596805527&linkCode=as2&tag=out0b4b-20&linkId=f490d30d420bf57fc1efe2de57eece65" onClick="ga('send', 'event', 'Shop', 'clicked', 'JavaScript The Definitive Guide');" target='_blank')
                img.img-responsive.img-center(src='//i.imgur.com/rLN9oKk.jpg' alt='JavaScript: The Definitive Guide book cover')
              .button-spacer
              a.btn.signup-btn.btn-cta(href="//www.amazon.com/gp/product/0596805527/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596805527&linkCode=as2&tag=out0b4b-20&linkId=f490d30d420bf57fc1efe2de57eece65" onClick="ga('send', 'event', 'Shop', 'clicked', 'JavaScript The Definitive Guide');" target='_blank') Get it on Amazon
              .spacer
              hr
              .spacer
              a(href="//www.amazon.com/gp/product/1593275676/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1593275676&linkCode=as2&tag=out0b4b-20&linkId=a6a83ec9ed8d137f3ff56fbcfc6c05ce" onClick="ga('send', 'event', 'Shop', 'clicked', 'How Linux Works');" target='_blank')
                img.img-responsive.img-center(src='//i.imgur.com/KU60I7r.jpg' alt='How Linux Works: What Every Superuser Should Know book cover')
              .button-spacer
              a.btn.signup-btn.btn-cta(href="//www.amazon.com/gp/product/1593275676/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1593275676&linkCode=as2&tag=out0b4b-20&linkId=a6a83ec9ed8d137f3ff56fbcfc6c05ce" onClick="ga('send', 'event', 'Shop', 'clicked', 'How Linux Works');" target='_blank') Get it on Amazon
              .spacer
              hr
              .spacer
              a(href="//www.amazon.com/gp/product/0596517742/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596517742&linkCode=as2&tag=out0b4b-20&linkId=644f8ba9661c9db7dd4bb3ff6216a8d1" onClick="ga('send', 'event', 'Shop', 'clicked', 'JavaScript the Good Parts');" target='_blank')
                img.img-responsive.img-center(src='//i.imgur.com/nR4VIU4.jpg' alt='JavaScript: The Good Parts book cover')
              .button-spacer
              a.btn.signup-btn.btn-cta(href="//www.amazon.com/gp/product/0596517742/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596517742&linkCode=as2&tag=out0b4b-20&linkId=644f8ba9661c9db7dd4bb3ff6216a8d1" onClick="ga('send', 'event', 'Shop', 'clicked', 'JavaScript the Good Parts');" target='_blank') Get it on Amazon
              .spacer
              hr
              .spacer
              a(href="//www.amazon.com/gp/product/1593275846/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1593275846&linkCode=as2&tag=out0b4b-20&linkId=6870174eac22afca8e1c1ef5204f16ee" onClick="ga('send', 'event', 'Shop', 'clicked', 'Eloquent JavaScript');" target='_blank')
                img.img-responsive.img-center(src='//i.imgur.com/CR2dSql.jpg' alt='Eloquent JavaScript: A Modern Introduction to Programming book cover')
              .button-spacer
              a.btn.signup-btn.btn-cta(href="//www.amazon.com/gp/product/1593275846/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1593275846&linkCode=as2&tag=out0b4b-20&linkId=6870174eac22afca8e1c1ef5204f16ee" onClick="ga('send', 'event', 'Shop', 'clicked', 'Eloquent JavaScript');" target='_blank') Get it on Amazon
              .spacer
              hr
              .spacer
              a(href="//www.amazon.com/gp/product/1118531647/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1118531647&linkCode=as2&tag=out0b4b-20&linkId=fdce3ef75bf3cd1cb220020a595decba" onClick="ga('send', 'event', 'Shop', 'clicked', 'JavaScript and jQuery');" target='_blank')
                img.img-responsive.img-center(src='//i.imgur.com/IplEMb4.jpg' alt='JavaScript and jQuery: Interactive Front End Development')
              .button-spacer
              a.btn.signup-btn.btn-cta(href="//www.amazon.com/gp/product/1118531647/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1118531647&linkCode=as2&tag=out0b4b-20&linkId=fdce3ef75bf3cd1cb220020a595decba" onClick="ga('send', 'event', 'Shop', 'clicked', 'JavaScript and jQuery');" target='_blank') Get it on Amazon
  