@media only screen and (max-width: 768px) {
  .pc {
    display: none !important;
  }
}

@media only screen and (max-width: 480px) {
  .pctb {
    display: none !important;
  }
}

@media only screen and (min-width: 769px) {
  .tb {
    display: none !important;
  }
}

@media only screen and (min-width: 481px) {
  .sp {
    display: none !important;
  }
}