main{
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

#member,#result{
  display: flex;
  flex-direction: column;
  align-items: center;
}

#member>div,#result>div{
  width: 300px;
}
#random-bt{
  width: 100px;
  margin-left: 24px;
  margin-right: 24px;
}

@media screen and (max-width:800px){
  main{
    flex-direction: column;
    height: initial;
  }

  #random-bt{
    margin-top: 24px;
    margin-bottom: 24px;
  }
}