diff --git a/learning/hello_world/main.frag b/learning/hello_world/main.frag
index 78a21c9..7d0b166 100644
--- a/learning/hello_world/main.frag
+++ b/learning/hello_world/main.frag
@@ -3,12 +3,27 @@ precision mediump float;
 #endif
 
 uniform float u_time;
+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+
+
 
 vec4 col() {
+  vec2 st = gl_FragCoord.xy/u_resolution;
+  vec2 mt = u_mouse/u_resolution;
+  
+  
+
+  // vec2 distanceVector = st-mt;
+  // float dist = sqrt(dot(distanceVector,distanceVector))
+  //this does the same as the previous commented code (i should've payed more attention to math)
+  float mod = 1.5-distance(st, mt);
+
   float r = abs(sin(u_time));
   float g = abs(cos(u_time/2.0));
   float b = abs(tan(u_time/3.0));
-  return vec4(r, g, b, 1.0);
+  
+  return vec4(r*mod, g*mod, b*mod, 1.0);
 }
 
 void main() {