body {
  background: linear-gradient(#dfb455,#e9744e);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
}
body p {
  font-size: 40px;
  font-weight: bold;
}
button {
  color: #000000;
  font-size: 16px;
  font-weight: bold;
  background: #fff;
  padding: 18px 30px;
  border-radius: 6px;
  display: inline-block;
  transition: .3s;
}
button:hover {
  transform: scale(1.1);
}

/* スマホ対応 */
@media screen and (max-width: 480px) {
  body {
    height: 100%;
  }

  body p {
    font-size: 32px;
}
}