body {
  font-family: monospace;
  background-color: #1e1e1e;
  color: #d4d4d4;
  padding: 20px;
}
#resultArea {
  font-size: 20px;
  user-select: none;
  min-height: 30px;
}
.dot {
  color: #6aaa64; /* 緑 */
}
.fail {
  color: #d16969; /* 赤 */
}
#summaryArea {
  font-size: 16px;
  margin-top: 20px;
  white-space: pre-wrap;
}
button {
  font-size: 16px;
  padding: 8px 16px;
  margin-bottom: 20px;
  cursor: pointer;
}
#shareBtn {
  display: none;
  background-color: #1DA1F2;
  color: white;
  border: none;
  margin-top: 10px;
}