@media (max-width: 991px) {
  * {
    box-sizing: border-box;
  }
  div.top,
  div.bar,
  div.main,
  div.sidebar,
  table.bar,
  table.bar hr,
  div.foot,
  table.mid,
  table.mid > tbody > tr > td,
  table.mid .txt_td,
  table#spec,
  div.display {
    width: 100%;
  }
  img {
    object-fit: cover;
  }
  .div.top > div:first:child {
    position: absolute;
    left: 70%;
  }
  div.bar {
    height: 80px;
    margin-top: 5px;
  }
  .topcart p.aright {
    display: block;
    padding-left: 45px;
  }
  table.bar .td_side br{
    display: none;
  }
  table.bar .td_side .title {
    margin-top: 10px;
  }
  div.display {
    margin-top: 10px;
  }
  div.item {
    width: 25%;
    height: auto;
    float: none;
    margin-bottom: 0;
    vertical-align: top;
  }
  table.mid > tbody > tr {
    display: flex;
    flex-direction: column;
  }
  table.mid .txt_td,
  table.mid > tbody tr:nth-child(2) {
    margin-top: 30px;
  }
  img#giftimg2 {
    margin-bottom: 5px;
  }
  a.bu {
    padding: 10 10  0 15px;
  }
}

@media (max-width: 767px) {
  a {
    display: inline-block;
  }
  a.bu {
    padding: 10 10  0 15px;
  }
  div.top {
    background-position: top 8px center; 
  }
  div.top > div {
    position: absolute !important;
    top: 10px !important;
    margin-left: auto;
    margin-right: auto;
    left: 0 !important;
    right: 0;
  }
  div.bar {
    text-align: center;
  }
  div.bar > div {
    display: none;
  }
  div.item {
    width: 100%;
    margin-bottom: 30px;
  }
  div.display {
    margin-top: 30px;
  }
  p.bname {
    font: 16px arial;
    display: inline-block;
    margin: 10px;
  }
  .topcart a.bu {
    padding-left: 5px;
  }
  .topcart p.aright {
    display: block;
    padding-left: 0;
    text-align: right;
  }
  div.sidebar {
    width: 100%;
  }
  table.bar {
    width: 100%;
  }
  div.item {
    width: 46%;
    margin: auto;
    margin-bottom: 10px;
  }
  table#spec tr {
    display: flex;
    flex-direction: column;
  }
  table#spec tr > td {
    width: 100%;
  }
  img#mainimg {
    width: 100%;
    margin: 0;
    height: 350px; 
  }
}
@media (max-width: 540px) {
  a.bu {
    padding: 10 10  0 15px;
  }
  .div.top > div:first:child {
    left: 65px;
    top: 5px;
  }
  div.item {
    width: 100%;
    margin-bottom: 60px;
  }
  img#giftimg2 {
    height: 200px;
    width: 200px;
    object-fit: cover;
  }
}