Tailwind does not delete unused css

**What version of Tailwind CSS are you using?**

 v3.4.3

**What build tool (or framework if it abstracts the build tool) are you using?**

postcss: 8.4.38

**What version of Node.js are you using?**

14.21.3

**What browser are you using?**
Chrome

**What operating system are you using?**
Windows

**Describe your issue**

Tailwind does not delete unused css.