kivy label background color kv file
Label:
text: "Storm"
size_hint: .6 , .15 #any size you want
pos_hint:{"x":.18, "y":.8} #any position you want
background_color: ((20/255,32/255,40/255,1)) #red,blue,green,clear numbers between 0-255
canvas.before:
Color:
rgba: self.background_color
Rectangle:
pos: self.pos
size: self.size