diff --git a/kernel/inc/drivers/graphics/renderer.h b/kernel/inc/drivers/graphics/renderer.h
index 39fdf55..cd2d8ba 100644
--- a/kernel/inc/drivers/graphics/renderer.h
+++ b/kernel/inc/drivers/graphics/renderer.h
@@ -58,6 +58,7 @@ graphics_buffer_T*  graphics_buffer_request             (uint32_t pos_x, uint32_
 void                graphics_buffer_show                (graphics_buffer_T* graphics_buffer);
 void                graphics_buffer_hide                (graphics_buffer_T* graphics_buffer);
 void                graphics_buffer_destruct            (graphics_buffer_T* graphics_buffer);
+void                graphics_buffer_shift_up            (graphics_buffer_T* graphics_buffer, uint16_t shift);
 void                graphics_buffer_set_pixel           (graphics_buffer_T* graphics_buffer, uint32_t x, uint32_t y, color_argb_T color);
 color_argb_T        graphics_buffer_get_pixel           (graphics_buffer_T* graphics_buffer, uint32_t x, uint32_t y);
 void                graphics_buffer_draw_char           (graphics_buffer_T* graphics_buffer, uint32_t x, uint32_t y, color_argb_T color, char chr);
diff --git a/kernel/src/drivers/graphics/renderer.c b/kernel/src/drivers/graphics/renderer.c
index efc3f1d..f568502 100644
--- a/kernel/src/drivers/graphics/renderer.c
+++ b/kernel/src/drivers/graphics/renderer.c
@@ -66,6 +66,16 @@ void graphics_buffer_destruct(graphics_buffer_T* graphics_buffer) {
     memory_free(graphics_buffer);
 }
 
+void graphics_buffer_shift_up(graphics_buffer_T* graphics_buffer, uint16_t shift) {
+    memory_copy(&graphics_buffer->buffer[graphics_buffer->width * shift],
+                graphics_buffer->buffer,
+                graphics_buffer->width * (graphics_buffer->height - shift) * sizeof(color_argb_T));
+
+    memory_set(&graphics_buffer->buffer[graphics_buffer->width * (graphics_buffer->height - shift)],
+               0,
+               graphics_buffer->width * shift * sizeof(color_argb_T));
+}
+
 void graphics_buffer_set_pixel(graphics_buffer_T* graphics_buffer, uint32_t x, uint32_t y, color_argb_T color) {
     graphics_buffer->buffer[y * graphics_buffer->width + x] = color;
 }
@@ -113,6 +123,10 @@ position_T graphics_buffer_draw_string(graphics_buffer_T* graphics_buffer, uint3
                     pos.x = 0;
                     pos.y += g_renderer.font.height;
                 }
+                if (pos.y + g_renderer.font.height >= graphics_buffer->height) {
+                    pos.y -= g_renderer.font.height;
+                    graphics_buffer_shift_up(graphics_buffer, g_renderer.font.height);
+                }
                 graphics_buffer_draw_char(graphics_buffer, pos.x, pos.y, color, string[i]);
                 pos.x += g_renderer.font.width;
                 break;
@@ -180,6 +194,8 @@ void graphics_renderer_update_graphics_buffer(graphics_buffer_T* graphics_buffer
 }
 
 void graphics_renderer_update() {
+    memory_set(g_renderer.back_buffer, 0, g_renderer.buffer_size);
+
     graphics_buffer_T* graphics_buffer = g_renderer.graphics_buffer_layers[GRAPHICS_BUFFER_STANDARD];
     while (graphics_buffer != NULL) {
         graphics_renderer_update_graphics_buffer(graphics_buffer);
diff --git a/kernel/src/kmain.c b/kernel/src/kmain.c
index a0a653e..56f5ecc 100644
--- a/kernel/src/kmain.c
+++ b/kernel/src/kmain.c
@@ -81,19 +81,23 @@ void kmain(boot_info_T boot_info) {
     limine_terminal_print(&boot_info, "Kernel initialized\n");
     log(LOG_INFO, "!=====[ Kernel Initialized ]=====!\n");
 
-    vfs_node_T* node_temp = vfs_node_create(g_vfs_root_node, "temp", VFS_NODE_DIRECTORY);
-    vfs_node_T* node_system = vfs_node_create(g_vfs_root_node, "system", VFS_NODE_DIRECTORY);
-    vfs_node_T* node_config = vfs_node_create(node_system, "config", VFS_NODE_DIRECTORY);
-    vfs_node_T* node_test = vfs_node_create(node_config, "test.conf", VFS_NODE_FILE);
-
-    vfs_node_T* result = vfs_resolve_path("/system/config/test.conf");
-    if (result == node_test) {
-        log(LOG_DEBUG, "resolve test passed");
-    } else {
-        log(LOG_DEBUG, "resolve test failed  0x%x != 0x%x", result, node_test);
+    for (int i = 0; i < 150; i++) {
+        log(LOG_DEBUG, "test log %d", i);
     }
 
-    vfs_node_dump_info(g_vfs_root_node, 0);
+//    vfs_node_T* node_temp = vfs_node_create(g_vfs_root_node, "temp", VFS_NODE_DIRECTORY);
+//    vfs_node_T* node_system = vfs_node_create(g_vfs_root_node, "system", VFS_NODE_DIRECTORY);
+//    vfs_node_T* node_config = vfs_node_create(node_system, "config", VFS_NODE_DIRECTORY);
+//    vfs_node_T* node_test = vfs_node_create(node_config, "test.conf", VFS_NODE_FILE);
+//
+//    vfs_node_T* result = vfs_resolve_path("/system/config/test.conf");
+//    if (result == node_test) {
+//        log(LOG_DEBUG, "resolve test passed");
+//    } else {
+//        log(LOG_DEBUG, "resolve test failed  0x%x != 0x%x", result, node_test);
+//    }
+
+//    vfs_node_dump_info(g_vfs_root_node, 0);
 
     CORE_HALT_FOREVER
 }