Question: After using ttk.Style().theme_create('name', settings={}) is it possible to see the settings of that theme? The reason I'm asking is that when I'm creating a new theme and I add ttk.Notebook(root) to my code, the tabs have rounded corners, which I do not want. Here is an example: import tkinter as tk import tkinter.ttk as ttk root = tk.Tk() root.title("Tab Example") root.geometry('270x270') background = '#ffffff' background_dark = '#f2f2f2' style = ttk.Style() style.theme_create('white', settings={ 'TLabel': {'configure': {'background': background}}, 'TFrame': {'configure': {'background': background}}, 'TNotebook': { 'configure': {'background': background_dark, 'tabmargins': [0, 7, 2, 0], 'padding': [7, 2]}}, 'TNotebook.Tab': { 'configure': {'background': background_dark, 'padding': [7, 2], 'focuscolor': 'clear'}, 'map': {'background': [('selected', background)]}}}) style.theme_use('white') tab = ttk.Notebook(root) tab1 = ttk.Frame(tab) tab2 = ttk.Frame(tab) tab.add(tab1, text='Tab 1') tab.add(tab2, text='Tab 2') tab.pack(expand=1, fill="both") ttk.Label(tab1, text="example").pack(padx=36, pady=36) ttk.Label(tab2, text="example 2").pack(padx=36, pady=36) root.mainloop()  If you remove style.theme_create() / style.theme_use() then the tabs no longer have rounded corners so the program must be adding that style in by default. If there isn't a way to see the theme settings (can't seem to find it in the docs) is there a list of possible settings that I can use? Something specifically for tab borders? On that note, there's a similar question, Is there a Tkinter/ttk style reference? however the first link in the provided answer doesn't list anything for border corners or border styles under ttk::notebook while the second link is unresponsive. EDIT Expanding upon Atlas435's answer, style_name = ttk.Notebook(None).winfo_class() # print(style_name) -> 'TNotebook' print(style.layout('TNotebook')) # -> [('Notebook.client', {'sticky': 'nswe'})] print(style.element_options('Notebook.client')) # -> ('borderwidth', 'background')  Except for 'background', I'm not able to see the names of the custom settings I used above for 'TNotebook': style.theme_create('white', settings={ 'TNotebook': {'configure': {'background': background_dark, 'tabmargins': [0, 7, 2, 0], 'padding': [7, 2]}}})  If I instead do this, I get closer to what I'm looking for but still not quite: print(style.layout('Tab')) # -> [('Notebook.tab', {'sticky': 'nswe', 'children': [('Notebook.padding', {'sticky': 'nswe', 'children': [('Notebook.label', {'sticky': 'nswe'})]})]})] print(style.element_options('Notebook.tab')) # -> ('borderwidth', 'background')  Cycling through the other element_options (Notebook.padding and Notebook.label) doesn't provide the values I'm looking for either :( EDIT 2 Some styling options aren't listed anywhere including the Tcl/Tk docs. An example of this is 'focuscolor' for 'TNotebook.Tab' which changes the color of the dashed lines around the Tab when it is in focus. Another example is when using ttk.Style().theme_use('default') or .theme_use('classic'), the Tab's in Notebook have rounded edges. If you use .theme_use('clam') or .theme_use('vista'), the Tab's in Notebook don't have rounded edges. I'm unable to find that style option in any documentation, and I cannot get it to print through the program (see above Edit section). For now I'm accepting the current best answer (Atlas435) for helping me come to this conclusion. A temporary solution for anyone else stumbling upon this could be to set either 'clam' or 'vista' as a parent when using ttk.Style().theme_create() or to create a picture that looks like a Tab with the styling you want and use tab.add(tab1, image=img) FINAL A full list is available, check out Atlas 435's answer

Answer: Offical list of all options by ttk finally found a list that includes all coloration options to style with ttk. https://wiki.tcl-lang.org/page/Changing+Widget+Colors  ttk.Button ttk::style configure TButton -background color ttk::style configure TButton -foreground color ttk::style configure TButton -font namedfont ttk::style configure TButton -focuscolor color ttk::style map TButton -background \ [list active color disabled color readonly color] ttk::style map TButton -foreground \ [list active color disabled color readonly color] ttk::style configure TButton -bordercolor color ttk::style configure TButton -lightcolor color ttk::style configure TButton -darkcolor color  ttk.Checkbutton ttk::style configure TCheckbutton -background color ttk::style configure TCheckbutton -foreground color ttk::style configure TCheckbutton -font namedfont ttk::style map TCheckbutton -background \ [list active color disabled color readonly color] ttk::style map TCheckbutton -foreground \ [list active color disabled color readonly color] ttk::style configure TCheckbutton -indicatorcolor color ttk::style map TCheckbutton -indicatorcolor \ [list selected color pressed color] ttk::style configure TCheckbutton -indicatorrelief relief ttk::style configure TCheckbutton -indicatormargin padding ttk::style configure TCheckbutton -indicatordiameter size ttk::style configure TCheckbutton -borderwidth size ttk::style configure TCheckbutton -focuscolor color  ttk.Combobox ttk::style configure TCombobox -background color ttk::style configure TCombobox -foreground color ttk::style configure TCombobox -fieldbackground color ttk::style configure TCombobox -darkcolor color ttk::style configure TCombobox -lightcolor color ttk::style configure TCombobox -selectbackground color ttk::style configure TCombobox -selectforeground color ttk::style configure TCombobox -bordercolor color ttk::style configure TCombobox -insertcolor color ttk::style configure TCombobox -insertwidth color ttk::style configure TCombobox -arrowsize size ttk::style configure TCombobox -arrowcolor color ttk::style map TCombobox -background \ [list disabled color readonly color] ttk::style map TCombobox -foreground \ [list disabled color readonly color] ttk::style map TCombobox -fieldbackground \ [list disabled color readonly color] option add *TCombobox*Listbox.background color option add *TCombobox*Listbox.foreground color option add *TCombobox*Listbox.selectBackground color option add *TCombobox*Listbox.selectForeground color  ttk.Entry ttk::style configure TEntry -background color ttk::style configure TEntry -foreground color ttk::style configure TEntry -fieldbackground color ttk::style configure TEntry -selectbackground color ttk::style configure TEntry -selectforeground color ttk::style configure TEntry -bordercolor color ttk::style configure TEntry -lightcolor color ttk::style configure TEntry -insertcolor color ttk::style configure TEntry -insertwidth color ttk::style map TEntry -background \ [list disabled color readonly color] ttk::style map TEntry -foreground \ [list disabled color readonly color] ttk::style map TEntry -fieldbackground \ [list disabled color readonly color] .entry configure -font namedfont  ttk.Labelframe ttk::style configure TLabelframe -background color ttk::style configure TLabelframe -bordercolor color ttk::style configure TLabelframe -lightcolor color ttk::style configure TLabelframe -darkcolor color ttk::style configure TLabelframe.Label -background color ttk::style configure TLabelframe.Label -foreground color ttk::style configure TLabelframe.Label -font namedfont  ttk.Listbox .listbox configure -background color .listbox configure -foreground color .listbox configure -disabledforeground color .listbox configure -selectbackground color .listbox configure -selectforeground color .listbox configure -font namedfont .listbox configure -borderwidth size .listbox configure -relief relief .listbox configure -highlightthickness size .listbox configure -highlightcolor color .listbox configure -highlightbackground color  menu .menu configure -background color .menu configure -foreground color .menu configure -activebackground color .menu configure -activeforeground color .menu configure -disabledforeground color .menu configure -font namedfont .menu configure -selectcolor color .menu configure -activeborderwidth size .menu configure -relief relief  ttk.Menubutton ttk::style configure TMenubutton -background color ttk::style configure TMenubutton -foreground color ttk::style configure TMenubutton -font namedfont ttk::style configure TMenubutton -arrowcolor color ttk::style map TMenubutton -background \ [list active color disabled color] ttk::style map TMenubutton -foreground \ [list active color disabled color] ttk::style map TMenubutton -arrowcolor \ [list active color disabled color]  ttk.Notebook ttk::style configure TNotebook -background color ttk::style configure TNotebook -bordercolor color ttk::style configure TNotebook -darkcolor color ttk::style configure TNotebook -lightcolor color ttk::style configure TNotebook.Tab -background color ttk::style configure TNotebook.Tab -foreground color ttk::style configure TNotebook.Tab -bordercolor color ttk::style configure TNotebook -focuscolor color ttk::style configure TNotebook -focusthickness size ttk::style configure TNotebook.Tab -focuscolor color ttk::style map TNotebook.Tab -background \ [list selected color active color disabled color] ttk::style map TNotebook.Tab -foreground \ [list selected color active color disabled color] ttk::style map TNotebook.Tab -lightcolor \ [list selected color {} color] ttk::style configure TNotebook.Tab -font namedfont ttk::style map TNotebook.Tab -font \ [list selected namedfont active namedfont disabled namedfont]  ttk.Panedwindow ttk::style configure TPanedwindow -background color ttk::style configure Sash -sashthickness 5 ttk::style configure Sash -sashrelief relief ttk::style configure Sash -sashpad 2 ttk::style configure Sash -handlesize 5 ttk::style configure Sash -handlepad 5 ttk::style configure Sash -background color ttk::style configure Sash -lightcolor color ttk::style configure Sash -bordercolor color  ttk.Progressbar ttk::style configure TProgressbar -background color ttk::style configure TProgressbar -troughcolor color ttk::style configure TProgressbar -lightcolor color ttk::style configure TProgressbar -darkcolor color ttk::style configure TProgressbar -bordercolor color ttk::style configure TProgressbar -barsize size ttk::style configure TProgressbar -pbarrelief relief ttk::style configure TProgressbar -borderwidth size  ttk.radiobutton ttk::style configure TRadiobutton -background color ttk::style configure TRadiobutton -foreground color ttk::style configure TRadiobutton -font namedfont ttk::style map TRadiobutton -background \ [list active color disabled color readonly color] ttk::style map TRadiobutton -foreground \ [list active color disabled color readonly color] ttk::style configure TRadiobutton -indicatorcolor color ttk::style map TRadiobutton -indicatorcolor \ [list selected color pressed color]  ttk.Scale ttk::style configure TScale -background color ttk::style configure TScale -troughcolor color ttk::style map TScale -background \ [list active color] ttk::style configure TScale -troughrelief relief ttk::style configure TScale -sliderrelief relief ttk::style configure TScale -sliderlength size ttk::style configure TScale -sliderthickness size ttk::style configure TScale -lightcolor color ttk::style configure TScale -darkcolor color ttk::style configure TScale -bordercolor color  ttk.Scrollbar ttk::style configure TScrollbar -background color ttk::style configure TScrollbar -troughcolor color ttk::style configure TScrollbar -arrowcolor color ttk::style configure TScrollbar -bordercolor color ttk::style configure TScrollbar -darkcolor color ttk::style configure TScrollbar -lightcolor color ttk::style configure TScrollbar -sliderrelief relief ttk::style map TScrollbar -background \ [list active color disabled color] ttk::style map TScrollbar -foreground \ [list active color disabled color] ttk::style map TScrollbar -arrowcolor \ [list disabled color]  ttk.Seperator ttk::style configure TSeparator -background color  ttk.Sizegrip ttk::style configure TSizegrip -background color  ttk.Spinbox ttk::style configure TSpinbox -background color ttk::style configure TSpinbox -foreground color ttk::style configure TSpinbox -darkcolor color ttk::style configure TSpinbox -lightcolor color ttk::style configure TSpinbox -fieldbackground color ttk::style configure TSpinbox -selectbackground color ttk::style configure TSpinbox -selectforeground color ttk::style configure TSpinbox -arrowsize size ttk::style configure TSpinbox -arrowcolor color ttk::style configure TSpinbox -bordercolor color ttk::style configure TSpinbox -insertcolor color ttk::style configure TSpinbox -insertwidth color ttk::style map TSpinbox -background \ [list active color disabled color readonly color] ttk::style map TSpinbox -foreground \ [list active color disabled color readonly color] ttk::style map TSpinbox -fieldbackground \ [list active color disabled color readonly color] ttk::style map TScrollbar -arrowcolor \ [list disabled color] .spinbox configure -font namedfont  ttk.Text .text configure -background color .text configure -foreground color .text configure -selectforeground color .text configure -selectbackground color .text configure -inactiveselectbackground color .text configure -insertbackground color .text configure -font namedfont .text configure -relief relief .text configure -borderwidth size .text configure -highlightcolor color .text configure -highlightthickness size .text configure -highlightbackground color  ttk.Treeview ttk::style configure Treeview -background color ttk::style configure Treeview -foreground color ttk::style configure Treeview -font namedfont ttk::style configure Treeview -fieldbackground color ttk::style map Treeview -background \ [list selected color] ttk::style map Treeview -foreground \ [list selected color] ttk::style configure Treeview -rowheight [expr {[font metrics namedfont -linespace] + 2}] ttk::style configure Heading -font namedfont ttk::style configure Heading -background color ttk::style configure Heading -foreground color ttk::style configure Heading -padding padding ttk::style configure Item -foreground color ttk::style configure Item -focuscolor color