body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
input {
  font-size: 4vw;
}
.after_generate {
  font-size: 4vw;
  line-height: 6vw;
  height: 6vw;
}