为什么我的汉堡包导航在桌面模式下无法加载？

I am coding a website for my high school, and I am using a hamburger navigation for the website. When the website is shrunk to mobile mode, the hamburger loads and everything works. But if I close the hamburger and bring the website back to Desktop mode, the navigation is gone, because the I am coding a website for my high school, and I