body {
  display: flex;
  flex-direction: column;
  align-items: center;
}

#reaction-time {
  font-size: 18px;
  color: #333;
  margin-bottom: 0.8rem;
}

#game-area {
  position: relative;
  width: 100%;
  height: 300px;
  border: 2px dashed var(--primary-color);
  margin: 20px 0;
  border-radius: 10px;
  max-width: 15cm;
}

#box {
  width: 50px;
  height: 50px;
  background-color: rgb(255, 101, 101);
  position: absolute;
  display: none;
  cursor: pointer;
  border-radius: 10px;
}

#message {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

@media (max-width: 400px) {
  body {
    padding-left: 10px !important;
    padding-right: 10px !important;
  }
}