@startuml
<style>
  title {
    BackGroundColor transparent
    FontColor black
    HorizontalAlignment center
  }  
</style>
label l [
{{
!theme amiga
title amiga
Alice -> Bob: amiga
Bob -> Alice: amiga
}}
{{
title ___________________________________  
}}
{{
!theme aws-orange
title aws-orange
Alice -> Bob: aws-orange
Bob -> Alice: aws-orange
}}
{{
title ___________________________________  
}}
{{
!theme black-knight
title black-knight
Alice -> Bob: black-knight
Bob -> Alice: black-knight
}}
{{
title ___________________________________  
}}
{{
!theme bluegray
title bluegray
Alice -> Bob: bluegray
Bob -> Alice: bluegray
}}
{{
title ___________________________________  
}}
{{
!theme blueprint
title blueprint
Alice -> Bob: blueprint
Bob -> Alice: blueprint
}}
{{
title ___________________________________  
}}
{{
!theme carbon-gray
title carbon-gray
Alice -> Bob: carbon-gray
Bob -> Alice: carbon-gray
}}
{{
title ___________________________________  
}}
{{
!theme cerulean-outline
title cerulean-outline
Alice -> Bob: cerulean-outline
Bob -> Alice: cerulean-outline
}}
{{
title ___________________________________  
}}
{{
!theme cerulean
title cerulean
Alice -> Bob: cerulean
Bob -> Alice: cerulean
}}
{{
title ___________________________________  
}}
{{
!theme cloudscape-design
title cloudscape-design
Alice -> Bob: cloudscape-design
Bob -> Alice: cloudscape-design
}}
{{
title ___________________________________  
}}
{{
!theme crt-amber
title crt-amber
Alice -> Bob: crt-amber
Bob -> Alice: crt-amber
}}
{{
title ___________________________________  
}}
]
@enduml