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

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

h1 {
  font-size: 24px;
  color: #333;
}

p {
  font-size: 16px;
  color: #666;
}

textarea {
  width: calc(100% - 20px);
  /* 考虑到padding为10px，需要减去20px */
  max-width: 100%;
  height: 100px;
  resize: vertical;
  font-size: 14px;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button {
  background-color: #4caf50;
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
}

button:hover {
  background-color: #45a049;
}

.preview-container {
  max-width: 600px;
  margin: 20px auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h2 {
  font-size: 20px;
  color: #333;
}

.svg-preview {
  max-width: 100%;
  overflow: auto;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 10px;
  background-color: #f9f9f9;
}

a {
  display: block;
  margin-top: 20px;
  text-decoration: none;
  font-size: 16px;
  color: #007bff;
}

a:hover {
  text-decoration: underline;
  color: #0056b3;
}