PlantUML Web Server

@startuml
!include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Context.puml

' <<<<< this section could be stored in a separate file and reused in all other diagrams too
' it defines new default colors, different default sprites and legend 
!$COLOR_A_5 = "#7f3b08"
!$COLOR_A_4 = "#b35806"
!$COLOR_A_3 = "#e08214"
!$COLOR_A_2 = "#fdb863"
!$COLOR_A_1 = "#fee0b6"
!$COLOR_NEUTRAL = "#f7f7f7"
!$COLOR_B_1 = "#d8daeb"
!$COLOR_B_2 = "#b2abd2"
!$COLOR_B_3 = "#8073ac"
!$COLOR_B_4 = "#542788"
!$COLOR_B_5 = "#2d004b"
!$COLOR_REL_LINE = "#8073ac"
!$COLOR_REL_TEXT = "#8073ac"

UpdateElementStyle("person", $bgColor=$COLOR_A_5, $fontColor=$COLOR_NEUTRAL, $borderColor=$COLOR_A_1, $shadowing="true", $legendText="Internal user")
UpdateElementStyle("external_person", $bgColor=$COLOR_B_5, $fontColor=$COLOR_NEUTRAL, $borderColor=$COLOR_B_1, $legendText="External user")
UpdateElementStyle("system", $bgColor=$COLOR_A_4, $fontColor=$COLOR_NEUTRAL, $borderColor=$COLOR_A_2, $sprite="robot", $legendText="Our chatbot based system")
UpdateElementStyle("external_system", $bgColor=$COLOR_B_4, $fontColor=$COLOR_NEUTRAL, $borderColor=$COLOR_B_2, $legendText="External system")
UpdateRelStyle($lineColor=$COLOR_REL_LINE, $textColor=$COLOR_REL_TEXT)
' >>>>> end of section

Person(customer, "Personal Banking Customer")
System(banking_system, "Internet Banking System")

System_Ext(mail_system, "E-mail system")
System_Ext(mainframe, "Mainframe Banking System")

Rel(customer, banking_system, "Uses")
Rel_Back(customer, mail_system, "Sends e-mails to")
Rel_Neighbor(banking_system, mail_system, "Sends e-mails")
Rel(banking_system, mainframe, "Uses")

SHOW_LEGEND()
@enduml

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