#define mtbox_width 16
#define mtbox_height 16
// static unsigned char mtbox_bits[] = {
static char mtbox_bits[] = {
   0x00, 0x00, 0xfe, 0x7f, 0x02, 0x40, 0x02, 0x40, 0x02, 0x40, 0x02, 0x40,
   0x02, 0x40, 0x02, 0x40, 0x02, 0x40, 0x02, 0x40, 0x02, 0x40, 0x02, 0x40,
   0x02, 0x40, 0x02, 0x40, 0xfe, 0x7f, 0x00, 0x00};