.sidebar-notice {
  background-color: #f5f5f5;
  padding: 10px;
  border: 2px solid #ccc;
  border-radius: 5px;
  margin-bottom: 10px;
  animation: colorChange 5s infinite;
}

.notice-title {
  font-size: 18px;
  font-weight: bold;
  margin-top: 0;
}

.notice-content {
  color: #333;
  line-height: 1.5;
}

.notice-link {
  display: inline-block;
  padding: 5px 10px;
  background-color: #555;
  color: #fff;
  text-decoration: none;
  border-radius: 3px;
  margin-top: 10px;
}

@keyframes colorChange {
  0% {
    background-color: #f5f5f5;
  }
  50% {
    background-color: #ffcc00;
  }
  100% {
    background-color: #f5f5f5;