still no idea why it isn't working

src/main/resources/shaders/shader.frag

@@ -1,5 +1,5 @@
 #version 330 core
-out vec4 FragColor;
+out vec4 fragColor;
 
 
 //uniform float light_power;
@@ -7,7 +7,7 @@ out vec4 FragColor;
 //uniform vec3 objectColor;
 //uniform vec3 viewPos;
 
-in vec3 FragPos;
+// in vec3 FragPos;
 //in vec3 Normal;
 //in vec3 LightPos;
 
@@ -18,6 +18,6 @@ const float screenGamma = 2.2; // Assume the monitor is calibrated to the sRGB c
 
 void main()
 {
-    FragColor = vec4(1.0f, 0.0f, 0.0f, 1.0f);
+    fragColor = vec4(1.0, 0.0, 0.0, 1.0);
 }