Header isn't condensing on mobile

[gingeleski]

The header of the website is not condensing properly for mobile. It's supposed to turn into the hamburger menu icon thing, but when browsing https://ethsec.io from my Pixel 3, it did not condense.

Previously I had noticed the proper behavior from Chrome when I slimmed down the window.

[gingeleski]

Update - tried slimming down my desktop Chrome window for the site and noticing the header doesn't behave properly there easier.

This must have broken at some point.