.content__box .sec__flex.sec__kensyu01::after {
  background: url(/assets/images/kensyu/kensyu01.avif) center center/cover no-repeat;
}
.content__box .sec__flex.sec__kensyu02::after {
  background: url(/assets/images/kensyu/kensyu02.avif) center center/cover no-repeat;
}
.content__box .sec__flex.sec__kensyu03::after {
  background: url(/assets/images/kensyu/kensyu03.avif) center center/cover no-repeat;
}