anchor.diff:                    //p One month of Spotify Premium 
                     p
                       a.btn.btn-success.btn-block(href='https://zarinp.al/86022', role='button') ♪♬((d⌒ω⌒b))♬♪
  -            .col-xs-6.col-sm-4.col-md-3
  +            .col-xs-12.col-sm-4.col-md-3
                 .thumbnail
                   img.img-responsive(src='/assets/image/ssd.png', alt='ssd', style='padding: 1em;')
                   .caption
  
positive.code:                   //p Everyone enjoys a good book
                    p
                      a.btn.btn-success.btn-block(href='https://zarinp.al/86020', role='button') ٩(◕‿◕)۶
              .col-xs-6.col-sm-4.col-md-3
                .thumbnail
                  img.img-responsive(src='/assets/image/spotify.png', alt='spotify', style='padding: 1em;')
                  .caption
  
negative.code:                   //p Buy me a cup of coffee 
                    p
                      a.btn.btn-success.btn-block(href='https://zarinp.al/86019', role='button') (　・ω・)⊃-[二二]
              .col-xs-12.col-sm-4.col-md-3
                .thumbnail
                  img.img-responsive(src='/assets/image/open-book.png', alt='open-book', style='padding: 1em;')
                  .caption
  