.HKaepidemicStoryBg{
  background: url(https://tkww-static.tkww.hk/special/HKStory/HKaepidemicStory_bg.png) center center/contain repeat;
  background-size: 100% auto;
  background-position: bottom;
  overflow: hidden;
}
.right-box:nth-child(even){
  background: url(https://tkww-static.tkww.hk/special/HKopportunities/HKopportunities_rt_bg.png) center center/contain repeat;
  background-size: 100% 100%;
}