@media (max-width: 840px) {
  .c-contents table, .c-contents table tbody, .c-contents table tr { display: block; width: 100%; }
  .c-contents table th, .c-contents table td { display: block; width: 100%; box-sizing: border-box; }
  .c-contents table th { text-align: center; background: var(--sg-plum-tint, #f6eef0); }
}