anchor.diff:  file.withOutputStream { out ->
       builder.build(out) {
           sheet('Sample') {
  -            row {
  +            row(2) {
                  style {
                      background whiteSmoke
                      border top, bottom {
  
positive.code:                        color black
                     }
                 }
                 cell {
                     value 'A'
                     style {
                         border left, {
  
negative.code:                }
             }
             row {
                 cell('B') { value 1 }
                 cell 2
                 cell 3
             }
  