Black borders.

The project should now be a 1:1 reproduction of the PC game, nice!

src/main.c

@@ -59,6 +59,9 @@ int main(void) {
 		dclear(C_BLACK);
 		level_draw(level, y_offset);
 		player_draw(player, y_offset);
+		/* Black borders. */
+		drect(0, 0, DRAW_OFFSET_X - 1, DHEIGHT, C_BLACK);
+		drect(DRAW_OFFSET_X + LEVEL_WIDTH_PX, 0, DWIDTH, DHEIGHT, C_BLACK);
 		dupdate();
 	}