myotp.kv

<Button>:

    background_color :  0.698, 0.133, 0.133,0.6
<Label>:
    color : 1,1,0.5,1


<MyGridLayout>:
    objname : name
    objemail : email
    objphone : phone
    objotp   : otp





    GridLayout:


        cols:1
        size : root.width , root.height

        GridLayout:

            cols:2

            Label:

                text : "Name: "

            TextInput:

                id : name
                multiline : False

            Label:

                text: " Email : "

            TextInput:

                id: email
                multiline : False

            Label:

                text: " Phone Number :"

            TextInput:

                id: phone
                multiline : False

        Button:
            id : sendbtn
            size_hint :  .1 , 0.3
            text: "Generate OTP" if sendbtn.state == "normal" else "Generating OTP"
            on_press : root.sendbtn()


        GridLayout:

            cols : 2
            Label:
                size_hint_y: 0.1
                text: " Enter OTP :"

            TextInput:

                height : 40
                pos_hint: {"y" : 1 , "top" : 1}
                id: otp
                multiline : False


        Button:
            id : authbtn
            size_hint : 0.1,1


            text: "Authenticate" if authbtn.state == "normal" else "Authenticating"
            on_press : root.authbtn()