Blurred featured image and the floating menu

Hi guys!

It looks like in some browsers (Edge?) the featured image that’s supposed to appear blurry as the background for the post title stays in it’s normal form, which makes the title illegible. In Chrome, it works fine. Is there a way to make it the same in all the browsers?

Also, the “menu button” (the one with pink lines) covers the logo in the floating menu when you open it on the computer. Before, it only appeared as a small, neat button in the left upper corner of the page if you opened it on the phone. Now, it also appears over the floating menu when you browse it on your PC, and it’s unclickable. Can I fix it somehow?

Thanks for reading this! I’ll be grateful for any help. ??