I recently followed the video to learn the self-writing framework, and rewrote the blog I learned from the teacher through the framework. During debugging, the page style was lost. The details are as follows: the routing is URL/controller/method, and the local test only inputs The page style is normal when www.blog.com (default controller index/method index) is entered, and the style is also normal when www.blog.com/index (/default method index) is entered.