diff --git a/main.c b/main.c
index d09108d..0a3bc71 100644
--- a/main.c
+++ b/main.c
@@ -15,10 +15,11 @@ const char *fragment_shader_source =
 "#version 330 core\n"
 "out vec4 FragColor;\n"
 "in vec2 uv;\n"
+"uniform vec2 WindowSize;\n"
 "\n"
 "void main()\n"
 "{\n"
-"    FragColor = vec4(gl_FragCoord.xy / 800, 0.0, 1.0);\n"
+"    FragColor = vec4(gl_FragCoord.xy / WindowSize, 0.0, 1.0);\n"
 "}\n";
 
 GLuint compile_shader(GLuint type, const char *src) {
@@ -81,14 +82,22 @@ int main() {
     GLuint shader = create_shader(fragment_shader_source);
     glUseProgram(shader);
 
+    int w, h;
     while (running) {
         while (SDL_PollEvent(&e)) {
             if (e.type == SDL_EVENT_QUIT) running = false;
+            if (e.type == SDL_EVENT_WINDOW_RESIZED) {
+                SDL_GetWindowSize(window, &w, &h);
+            }
         }
         checkGlError();
 
         // Rendorrrr
-        glViewport(0, 0, 800, 800);
+        glViewport(0, 0, w, h);
+
+        int uniform_WindowSize = glGetUniformLocation(shader, "WindowSize");
+        glUniform2f(uniform_WindowSize, w, h);
+
         glClearColor(0.1f, 0.1f, 0.1f, 1.0f);  // Dark gray background
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);