body{}

.maruyuki {
  text-align: center;
}

#tango {
  height: 170px;
  line-height: 50px;
  font-size: 20px;
  font-weight: bold;
}

.btn--submit,
input.btn--submit {
  font-size: 1.6rem;
  color: #fff;
  background-color: #0099ff;
  padding: 1rem 3rem;
}
.btn--submit:hover,
input.btn--submit:hover {
  color: #fff;
  background: #3333ff;
}

input.btn--radius {
  border-radius: 100vh;
}

.random_tango {
  opacity: 0;
  animation-name: SlideIn;
  animation-duration: 1s;
  animation-fill-mode: forwards; /*これで値を保持*/
}

#name2 {
  animation-delay: 200ms;
}

#name3 {
  animation-delay: 400ms;
}

/* CSSアニメーションの設定 */
@keyframes SlideIn {
  0% {
    opacity: 0; /*初期状態では透明に*/
    transform: translateX(64px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}