body {
  font-family: Arial, sans-serif;
  background: #f0f0f0;
  margin: 0;
  padding: 20px;
  text-align: center;
}

.container {
  max-width: 600px;
  margin: auto;
  background: #fff;
  padding: 20px;
  border-radius: 4px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

input, textarea, button {
  width: 100%;
  margin: 10px 0;
  padding: 10px;
  font-size: 16px;
}

textarea {
  height: 200px;
  resize: vertical;
}

button {
  background: #007bff;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}

#message {
  color: red;
  font-weight: bold;
}

#tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.tab {
  background: #ddd;
  padding: 8px;
  margin: 3px;
  cursor: pointer;
  border-radius: 4px;
}

.tab.active {
  background: #007bff;
  color: white;
}