/* ############## */
@media screen and (min-width: 0px) and (max-width: 400px) {
  #accordionA{ display: block; }  /* show it on smaller screen */
}
@media screen and (min-width: 401px) and (max-width: 2000px) {
  #accordionA{ display: none; }   /* hide it on larger screens */
}

.AAAA::after {
  margin-left: 50%;
}