.sec_mv::before {
  background-image: url(../kosei/img/mv_bg_sp@2x.jpg);
}
@media print, screen and (min-width: 780px) {
  .sec_mv::before {
    background-image: url(../kosei/img/mv_bg@2x.jpg);
  }
}

.sec_data .chart {
  background-image: url(../kosei/img/chart.svg);
}