diff --git a/includes/tart.h b/includes/tart.h
index f4056fa..65c8577 100644
--- a/includes/tart.h
+++ b/includes/tart.h
@@ -25,7 +25,7 @@ extern "C" {
 #define TART_CELL_DATA_SIZE 16 // todo add number
 #else
 #define NULL_CELL (struct tart_cell){0,0,0,0}
-#define TART_CELL_DATA_SIZE 16
+#define TART_CELL_DATA_SIZE 20
 #endif
 #define TART_OK 0
 
diff --git a/source/tart.c b/source/tart.c
index ee7b54b..e54c4a7 100644
--- a/source/tart.c
+++ b/source/tart.c
@@ -18,6 +18,11 @@ struct tart_window tart_create_window() {
         window.buffers[i] = tart_create_buffer(0, (struct tart_vec2){0,0},(struct tart_vec2){0,0});
     }
     window.size = term_current_size();
+    window.data = malloc((window.size.x * window.size.y * sizeof(char) * TART_CELL_DATA_SIZE)+ 100 );
+    for(int g = 0; g < (window.size.x * window.size.y * sizeof(char) * TART_CELL_DATA_SIZE)+ 100; g++) {
+        window.data[g] = '\0';
+    }
+    window.data_count = (window.size.x * window.size.y * sizeof(char) * TART_CELL_DATA_SIZE)+ 100;
     return window;
 }
 
@@ -79,7 +84,6 @@ struct tart_cell tart_set_cell(struct tart_buffer* buffer, struct tart_cell cell
 tart_byte tart_draw_window(struct tart_window * window, char* rend_buffer) {
     int offset = 0;
     int i = 0;
-    window->data = malloc((window->size.x * window->size.y * sizeof(char) * TART_CELL_DATA_SIZE)+ 100 );
     for (int b = 0;b < 0xFF; b++) {
         if(window->buffers[b].cell_count == 0) 
             continue;
@@ -87,7 +91,7 @@ tart_byte tart_draw_window(struct tart_window * window, char* rend_buffer) {
             for (int x = 0; x < window->buffers[b].size.x; x++) {
                     // add data to window c buffer.
                     struct tart_cell cell = window->buffers[b].cells[(y*window->buffers[b].size.x) + x];
-                    char pre[16];
+                    char pre[TART_CELL_DATA_SIZE];
                     int size = sprintf(pre, "\033[%d;%d;%dm%c\033[0;0m", (int)cell.style, cell.foreground, cell.background, cell.display);
                     for(int preIdx = 0; preIdx < size; preIdx++) {
                         window->data[(y*window->buffers[b].size.x) + x + offset] = pre[preIdx];
@@ -103,8 +107,7 @@ tart_byte tart_draw_window(struct tart_window * window, char* rend_buffer) {
             i++;
         }
     }
-    fwrite(window->data, sizeof(char), (window->size.x * window->size.y * sizeof(char))+ 100 , stdout);
-    free(window->data);
+    fwrite(window->data, sizeof(char), window->data_count, stdout);
     return TART_OK;
 };
 
diff --git a/testing/render_test/main.cpp b/testing/render_test/main.cpp
index 0875d57..420e6dc 100644
--- a/testing/render_test/main.cpp
+++ b/testing/render_test/main.cpp
@@ -1,18 +1,21 @@
 #include <tart.h>
+#include <memory.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 int main (int argc, char *argv[]) {
     struct tart_window window = tart_create_window();
-    struct tart_buffer mainbuff = tart_create_buffer(109, {20,20},{20,20});
-    struct tart_cell cells[20*20];
-    for(int i = 1; i < 20*20; i += 2) {
-        cells[i] = tart_create_cell('^', TART_STYLE_BOLD, TART_COLOR_BLACK_FOREGROUND, TART_COLOR_WHITE_BACKGROUND);
+    struct tart_buffer mainbuff = tart_create_buffer(109, {100,50},{20,20});
+    struct tart_cell* cells = (struct tart_cell*)malloc(mainbuff.cell_count * sizeof(struct tart_cell));
+    for(int i = 1; i < mainbuff.cell_count; i += 2) {
+        cells[i] = tart_create_cell('^', TART_STYLE_BLINKING, TART_COLOR_BLACK_FOREGROUND, TART_COLOR_WHITE_BACKGROUND);
     }
-    for(int i = 0; i <  + 20*20; i += 2) {
-        cells[i] = tart_create_cell('^', TART_STYLE_BOLD, TART_COLOR_WHITE_BACKGROUND, TART_COLOR_BLACK_BACKGROUND);
+    for(int i = 0; i <  + mainbuff.cell_count; i += 2) {
+        cells[i] = tart_create_cell('^', TART_STYLE_BLINKING, TART_COLOR_RED_FOREGROUND, TART_COLOR_BLACK_BACKGROUND);
     }
     tart_add_cells_to_buffer(&mainbuff, cells);
 
-    char* t;
+    char t[1] = {'0'};
     tart_add_buffer(&window, mainbuff);
     tart_draw_window(&window, t);