diff --git a/main.cc b/main.cc
index 29a9a0b..35cf9eb 100644
--- a/main.cc
+++ b/main.cc
@@ -42,13 +42,18 @@ GLuint linkProgram(std::vector<GLuint> shaders) {
   return program;
 }
 
+
+void resizeCall(GLFWwindow *window, int width, int height) {
+  glViewport(0, 0, width, height);
+}
+
+
 int main() {
   if (!glfwInit())
     return -1;
 
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
   glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
-  glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);
 
   GLFWwindow *w = glfwCreateWindow(800, 600, "game of life", NULL, NULL);
   if (!w)
@@ -60,7 +65,8 @@ int main() {
     return -3;
 
   glfwShowWindow(w);
-  glViewport(0, 0, 800, 637);
+  glViewport(0, 0, 800, 600);
+  glfwSetFramebufferSizeCallback(w, resizeCall);
 
   /*gen tex*/
   GLuint tex[2];