Kivy: How to add padding to a Text Input

Question

Just a simple problem here - I would like to add some 'padding' to my text input box so as to align it with a label above it: see here

Here are the relevant sections of my .kv file:

<InstructionsLabel>:
    font_size: 24
    size_hint_y: None
    color: 0.447, 0.094, 0.737, 1
    text_size: root.width, None
    size: self.texture_size
    padding_x: 20

<LengthExactScreen>:
    canvas.before:
        Color:
            rgba: 1, 1, 1, 1
        Rectangle:
            pos: self.pos
            size: self.size
    FloatLayout:
        DirectionButton:
            text: "Back"
            pos_hint: {'left': 1, 'top': 1}
            on_press:
                root.manager.transition.duration = 0
                root.manager.current = "tool_screen"
        DirectionButton:
            text: "Done"
            pos_hint: {'right': 1, 'top': 1}
            on_press: root.compute_orders(root.itemList, int(len_exact_input.text))
    GridLayout:
        cols: 1
        pos_hint: {'top': 0.86}
        BoxLayout:
            size_hint_y: None
            height: self.minimum_height
            orientation: "vertical"
            InstructionsLabel:
                text: "Enter the number of items you want to order"
            TextInput:
                id: len_exact_input
                size_hint: None, None
                width: 300
                height: 35
                multiline: False
                hint_text: ""

Answer 1

TextInput has also a padding property.

Change this to match the padding on your label

TextInput:
    padding_x:[20,0]

Here is a sample App I wrote to see that adopted from your code. Unfortunately, your code has several issues and it was easier to do it like that

from kivy.app import App
from kivy.base import Builder
from kivy.uix.boxlayout import BoxLayout

Builder.load_string("""
<rootwi>:
    orientation: 'vertical'
    Label:
        font_size: 24
        text: 'iuqwdouqwdoqdwpqwpow'
        color: 0.447, 0.094, 0.737, 1
        text_size: root.width, None
        size: self.texture_size
        padding_x: 20
    TextInput:
        padding_x:[20,0]
""")
class rootwi(BoxLayout):
    pass

class MyApp(App):
    def build(self):
        return rootwi()


if __name__ == '__main__':
    MyApp().run()