Custom Sprite Shader Ignore Light

Hi!

The "Sprite-Default" shader used for 2D sprites ignores the built-in light.

I have "written" (modified a shader I found online) a custom shader that outlines a sprite and the outlining works well.

However, this custom shaders does not ignore the built-in light, which means the sprite is rendered differently from the other sprites that ignore the light.

What do I need to add to my custom shader to make it ignore the built in light?

I have looked a the Sprite-Default shader and I can't figure out what to do.

This is how my custom shader looks;

 Shader "Custom/Outline2D" {
     Properties 
     {
         _MainTex ("Base (RGB)", 2D) = "white" {}
         _OutLineSpread ("Outline Spread", Range(0,0.012)) = 0.007
         _Alpha ("Alpha", float) = 1
         _Color ("Color", Color) = (1,1,1,1)
     }
  
     SubShader
     {
         Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
         ZWrite On Blend One OneMinusSrcAlpha Cull Off
         LOD 110
  
         CGPROGRAM
         #pragma surface surf Lambert alpha
  
         struct Input 
         {
             float2 uv_MainTex;
             fixed4 color : COLOR;
         };
  
         sampler2D _MainTex;
         float _OutLineSpread;
         float _Alpha;
         fixed4 _Color;
  
         void surf(Input IN, inout SurfaceOutput o)
         {
             fixed4 mainColor =
             (tex2D(_MainTex, IN.uv_MainTex+float2(_OutLineSpread,_OutLineSpread))
             + tex2D(_MainTex, IN.uv_MainTex+float2(-_OutLineSpread,-_OutLineSpread))
             + tex2D(_MainTex, IN.uv_MainTex+float2(-_OutLineSpread,_OutLineSpread))
             + tex2D(_MainTex, IN.uv_MainTex+float2(_OutLineSpread,-_OutLineSpread)))
             * fixed4(_Color.r, _Color.g, _Color.b, _Alpha);
 
             mainColor = fixed4(1,1,1, mainColor.a);
             
             fixed4 addcolor = tex2D(_MainTex, IN.uv_MainTex) * IN.color;
  
             if(addcolor.a > _Alpha - 0.05){
             mainColor = addcolor;}
  
             o.Albedo = mainColor.rgb;
             o.Alpha = mainColor.a;
         }
         ENDCG       
     }
 }