body {
  font-family: sans-serif;
  padding: 20px;
  background: #f0f0f0;
}

.tabs {
  display: flex;
  border-bottom: 2px solid #ccc;
}

.tab-button {
  flex: 1;
  padding: 10px;
  background-color: #e0e0e0;
  border: none;
  cursor: pointer;
  text-align: center;
  font-size: 16px;
}

.tab-button.active {
  background-color: #3498db;
  color: white;
}

.tab-content {
  display: none;
  padding: 20px;
  background-color: white;
  margin-top: 20px;
  border: 1px solid #ccc;
}

.tab-content.active {
  display: block;
}

.notification {
  background: white;
  margin-bottom: 12px;
  padding: 10px;
  border-left: 5px solid #3498db;
}