,I am Trying to make A Colored Vignette Effect and I don't know how

// my goal is to make a shader something like this

 https://www.leovst.com/shaders/

Can someone help me achieved this i will need to access this shader throug matterial later so if someone could made the sahder please add some comments too thank you so much.

better if the vignette Effect is square

 Shader "Custom/Aura"
     {
         Properties
         {
              _MainTex("Texture", 2D) = "white" {}
              _Color("Color", Color) = (1, 1, 1, 1)![alt text][1]
              _VRadius("Vignette Radius", Range(0.0, 1.0)) = 1
              _VSoft("Vignette Softness", Range(0.0, 1.0)) = 0.5
         }
     
         SubShader
         {
             Pass
             {
                 CGPROGRAM
                 #pragma vertex vert_img
                 #pragma fragment frag
                 #include "UnityCG.cginc"
                 
                 // Properties
                 sampler2D _MainTex;
                 float4 _Color;
                 float4 _GlitchColor;
                 float _VRadius;
                 float _VSoft;
     
                 float4 frag(v2f_img input) : COLOR
                 {
                     // sample texture for color
                     float4 base = tex2D(_MainTex, input.uv);
                     // average original color and new color
                     base = base * _Color;
     
     
                     //　I want to change the color of the Vignette itself not the base color
                     // I want to change the Black Vignette to other color 
     
     
                     // add vignette
                     float distFromCenter = distance(input.uv.xy, float2(0.5, 0.5));
                     float vignette = smoothstep(_VRadius, _VRadius - _VSoft, distFromCenter);
     
                     base = saturate(base * vignette);
                     
                     return base;
     
     
                 }
     
                 ENDCG
             }
         }
     }
 

 

, Shader "Custom/Aura" { Properties { _MainTex("Texture", 2D) = "white" {} _Color("Color", Color) = (1, 1, 1, 1) _VRadius("Vignette Radius", Range(0.0, 1.0)) = 1 _VSoft("Vignette Softness", Range(0.0, 1.0)) = 0.5 }

     SubShader
     {
         Pass
         {
             CGPROGRAM
             #pragma vertex vert_img
             #pragma fragment frag
             #include "UnityCG.cginc"
             
             // Properties
             sampler2D _MainTex;
             float4 _Color;
             float4 _GlitchColor;
             float _VRadius;
             float _VSoft;
 
             float4 frag(v2f_img input) : COLOR
             {
                 // sample texture for color
                 float4 base = tex2D(_MainTex, input.uv);
                 // average original color and new color
                 base = base * _Color;
 
 
                 //　I want to change the color of the Vignette itself not the base color
                 // I want to change the Black Vignette to other color 
 
 
                 // add vignette
                 float distFromCenter = distance(input.uv.xy, float2(0.5, 0.5));
                 float vignette = smoothstep(_VRadius, _VRadius - _VSoft, distFromCenter);
 
                 base = saturate(base * vignette);
                 
                 return base;
 
 
             }
 
             ENDCG
         }
     }
 }