/* Keep each arrow's layout slot, so its active neighbour never moves. */
:is(#prevBtn, #nextBtn, #prevLessons, #nextLessons):is(:disabled, [aria-disabled="true"]),
:is(#prevBtn, #nextBtn, #prevLessons, #nextLessons):is(:disabled, [aria-disabled="true"]) *,
:is(#prevBtn, #nextBtn, #prevLessons, #nextLessons):is(:disabled, [aria-disabled="true"])::before,
:is(#prevBtn, #nextBtn, #prevLessons, #nextLessons):is(:disabled, [aria-disabled="true"])::after {
  visibility: hidden !important;
  pointer-events: none !important;
}