body {
  text-align: center;
}

input[type="number"] {
  margin: 5px;
}

#message{
  min-height: 24px;
  color: #ff0000;
}

.info {
  border: solid 2px #4682b4;
  border-radius: 20px;
  width: 600px;
  margin: 10px auto 10px auto;
}

/* ボタン */
.btn {
  width: 150px;
  margin: 0px 0px 10px 0px;
  color: white;
  text-align: center;
  font-size: 21px;
  font-weight: bold;
  background-color: #87cefa;
  border-radius: 10px;
  cursor: pointer;
  border: 0px;
  padding: 5px;
}

#stone {
  font-size: 21px;
  color: #4682b4;
  text-align: left;
  display: inline-block;
  margin-top:0px;
}