slim-lang's if-else nested code

I want to assign a css class to a part of HTML based on condition in slim-lang I am doing the following - if current_user .title - else .title_else Now how can i write the HTML that should be nested in the one of the class above? Do i need to write HTML in the both if condition and else condition ? The reason is that the HTML that should be nested in one of the above class should be further intend