Vertical choices on ADV mode

gistfile1.txt

########## script.rpy ##########
label start:
    "Choose the correct box!"
    menu:
        "RIGHT BOX":
            "Umm, right?"
        "LEFT BOX":
            "Umm, left?"
    "It's wrong!"
    "The other box is correct, isn't it?"
    "Both boxes are wrong!"

########## screens.rpy ##########

screen choice:

    window: 
        style "menu_window"        
        xalign 0.5
        yalign 0.5
        
        hbox:
            style "menu"
            spacing 2
            box_reverse True
            
            for caption, action, chosen in items:
                
                if action:  
                    
                    button:
                        style "menu_choice_button"
                        action action
                        xminimum None xmaximum None

                        text caption style "menu_choice" vertical True
                    
                else:
                    text caption style "menu_caption" vertical True

init -1 python:
        style.menu_choice_button.yminimum = int(config.screen_height * 0.75)
        style.menu_choice_button.ymaximum = int(config.screen_height * 0.75)