table.table2{
  border-collapse: collapse;
  width: 40%;
}
table.table2 th,
table.table2 td{
  padding: 10px;
  border: none;
  font-family: "ＭＳ ゴシック",sans-serif;
}
table.table2 th{
  background-color: #f6f6f6;
  text-align: left;
  width: 25%;
}

@media screen and (max-width: 767px) {
  table.table2{
    border-top: 1px solid #ccc;
  }
  table.table2 td{
    display: block;
    text-align: left;
  }
  table.table2 th{
    display: block;
    border-top: none;
    border-bottom: none;
    width: 100%;
  }
}