@media only screen and (max-width: 768px) {
  thead {
    display: none;
  }
  td {
    display: block;
  }
  td:before {
    content: attr(data-th);
    display: block;
    font-weight: bold;
    text-align: center;
  }
}

@media only screen and (max-width: 1000px) {
  thead {
    display: none;
  }
  td {
    display: block;
  }
  td:before {
    content: attr(data-th);
    display: block;
    font-weight: bold;
    text-align: center;
  }
}