* {
  user-select: none;
  -webkit-user-drag: none;
  -moz-user-select: none;
  font-family: 'NotoSansJP-Regular', Tahoma, Geneva, Verdana, sans-serif, Geneva, Verdana, sans-serif;
}
body {
  background-color: rgb(0, 0, 0);
  color: rgb(204, 204, 204);
}
div#container {
  text-align-last: center;
  margin: 64px auto;
  max-width: 720px;
  border-radius: 24px;
  padding: 20px 0 60px;
  background-color: rgb(31, 31, 31);
}
button {
  cursor: pointer;
  border: solid 2px #dddddd;
  border-radius: 18px;
  color: white;
  font-size: 20px;
  padding: 12px;
  background-color: rgb(61, 61, 61);
}
button:hover {
  background-color: rgb(48, 48, 48);
}
button:active {
  background-color: rgb(36, 36, 36);
}