.table_oyako {
  border-collapse: collapse;
  table-layout: fixed;
  width: 100%;
  max-width: 700px;
  text-align: center;
}
.table_oyako th, .table_oyako td {
  border: 2px solid #b3b3b3;
  padding: 10px;
}
.table_oyako thead th {
  background-color: #b33636;
  color: #fff;
  border: 2px solid #b33636;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
}
.table_oyako thead th:last-of-type {
  border-right: 2px solid #b33636;
}
.table_oyako tbody th {
  color: #b33636;
  font-weight: bold;
  text-align: center;
}

@media screen and (max-width: 787px) {
  .table_oyako {
    text-align: left;
  }
  .table_oyako thead {
    display:none;
  }
  .table_oyako th, .table_oyako td {
    display: block;
    border: 0;
    border-bottom: 2px solid #b3b3b3;
  }
  .table_oyako tbody th{
    background: #b33636;
    color:#fff;
  }
  .table_oyako td::before{
    content: attr(data-label);
    color: #b33636;
    font-weight: bold;
    display: inline-block;
    width: 20%;
    min-width: 4em;
  }
}