Thank you so so much, tuanphan!
I really appreciate your quick help! Could I possibly ask you one more thing? While I was checking the icon on my phone I realized that on some pages my mobile hamburger and the whole menu items are pushed slightly to the right. (Not from the CSS you provided, default two thin line hamburger icon does the same thing.)
For example, when I'm on video tutorial page(https://pepper-guppy-sw32.squarespace.com/video-tutorials) the hamburger icon is in the right place and shows the menu list right. Some other pages such as HOME, Curated posts and etc, the ham