@media screen and (min-width: 641px) {
  .tesWrap{
    background:  url(//kao-h.assetsadobe3.com/is/image/content/dam/sites/kao/www-kao-co-jp/bioreuv/teasersite/bg_main.png?qlt=90&wid=1920);
    background-size: 100% 100%;
  }
}
@media screen and (max-width: 640px) {
  .tesWrap{
    background:  url(//kao-h.assetsadobe3.com/is/image/content/dam/sites/kao/www-kao-co-jp/bioreuv/teasersite/sp_bg_main.png?qlt=90&wid=750);
    background-size: cover;
  }
}