body {
  font-family: 'Arial', sans-serif;
  background-color: #f0f2f5;
  margin: 0;
  padding: 10px;
}

h1, h2 {
  color: #333;
}

h1 {
  color: #333;
  text-align: center; /* 新增這行代碼以置中標題 */
}

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

.section {
  background: #fff;
  padding: 20px;
  margin: 10px;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  width: 80%;
  max-width: 600px;
}

input, select, button {
  padding: 10px;
  margin: 5px;
  border-radius: 5px;
  border: 1px solid #ccc;
}

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

button:hover {
  background-color: #0056b3;
}

#current-timestamp, #readable-time, #output-timestamp {
  padding: 10px;
  background-color: #e9ecef;
  width: calc(100% - 22px); /* account for padding and border */
}