@startuml

skinparam componentStyle uml2

skinparam component {
BorderColor #grey
BackgroundColor #white
}

skinparam class {
BorderColor #grey
BackgroundColor #white
}

package com.myapp.moduleone {
class ClassOneInModuleOne
class ClassTwoInModuleOne
}
package com.myapp.moduletwo {
class ClassOneInModuleTwo
class ClassTwoInModuleTwo
}
package com.myapp.modulethree {
class ClassOneInModuleThree
class ClassTwoInModuleThree
}

ClassOneInModuleOne --> ClassTwoInModuleTwo #crimson
ClassOneInModuleTwo --> ClassOneInModuleThree #crimson
ClassTwoInModuleThree --> ClassOneInModuleOne #crimson
@enduml