.subbtn ul {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: start;
      -ms-flex-pack: start;
          justify-content: start;
  margin: 25px 0 0;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
}
.subbtn li {
  position: relative;
  margin: 0;
  width: 45vw;
  height: 10.125vw;
}
.subbtn li.syugyou {
  background-size: 100% 200%;
}
.subbtn li.kingDragon {
  background-size: 100% 200%;
}
.subbtn li.strongSkill {
  background-size: 100% 200%;
}
.subbtn li.weakPoint {
  background-size: 100% 199%;
}
.subbtn li.boukentan {
  background-size: 100% 199%;
}

.episodebtn-item {
  position: relative;
  position: relative;
  width: 45vw;
  height: 16.65vw;
}
.episodebtn-item a {
  display: block;
  position: relative;
  cursor: pointer;
  width: 100%;
  height: 100%;
}
.episodebtn-item a.btnimg {
  background: url(../img/system/btn_episode.png) 0% 0% no-repeat;
  background-size: 100% 202%;
}