body{
  width: 100%;
  height: 100vh;
}
#wrap{
  width: 100%;
  height: 100%;
}
#contents{
  padding: 5% 5%;
  background: lightblue;
  height: 100%;
}
#stage{
  width: 100%;
  height: 75%;
}
#ope button{
  background: gray;
  color: #fff;
}
#step{
  background: greenyellow;
  color: black;
}
#step ul{
  display: flex;
  justify-content: space-between;
}
#step span{
  border-bottom: black 2px solid;
}