with open('/www/wwwroot/gaokao/index.html', 'r') as f:
    content = f.read()

# Find the first <style> tag
first_style = content.index('<style>')
# Find the last </style> tag
last_style_end = content.rindex('</style>') + len('</style>')

before = content[:first_style]
after = content[last_style_end:]

# Read the new CSS from a separate file (will write separately)
new_html = before + '<!-- CSS_REPLACEMENT_MARKER -->' + after

with open('/www/wwwroot/gaokao/index.html', 'w') as f:
    f.write(new_html)
print('Marked')