@startuml
<style>
  title {
    BackGroundColor transparent
    FontColor black
    HorizontalAlignment center
  }  
</style>
label l [
{{
!theme minty
title minty
Alice -> Bob: minty
Bob -> Alice: minty
}}
{{
title ___________________________________  
}}
{{
!theme mono
title mono
Alice -> Bob: mono
Bob -> Alice: mono
}}
{{
title ___________________________________  
}}
{{
!theme plain
title plain
Alice -> Bob: plain
Bob -> Alice: plain
}}
{{
title ___________________________________  
}}
{{
!theme reddress-darkblue
title reddress-darkblue
Alice -> Bob: reddress-darkblue
Bob -> Alice: reddress-darkblue
}}
{{
title ___________________________________  
}}
{{
!theme reddress-darkgreen
title reddress-darkgreen
Alice -> Bob: reddress-darkgreen
Bob -> Alice: reddress-darkgreen
}}
{{
title ___________________________________  
}}
{{
!theme reddress-darkorange
title reddress-darkorange
Alice -> Bob: reddress-darkorange
Bob -> Alice: reddress-darkorange
}}
{{
title ___________________________________  
}}
{{
!theme reddress-darkred
title reddress-darkred
Alice -> Bob: reddress-darkred
Bob -> Alice: reddress-darkred
}}
{{
title ___________________________________  
}}
{{
!theme reddress-lightblue
title reddress-lightblue
Alice -> Bob: reddress-lightblue
Bob -> Alice: reddress-lightblue
}}
{{
title ___________________________________  
}}
{{
!theme reddress-lightgreen
title reddress-lightgreen
Alice -> Bob: reddress-lightgreen
Bob -> Alice: reddress-lightgreen
}}
{{
title ___________________________________  
}}
]
@enduml