.box_tbl thead th{
  text-align:center;
}
.box_tbl thead th,
.box_tbl tbody td {
  padding: 0 5px;
   box-sizing:border-box;
  text-align:center;
}
@media only screen and (max-width: 480px) {
  .box_tbl {
    font-size:90%;
    letter-spacing: -.02em;
  }
  .box_tbl tbody td{
    text-align:left;
  }
}