Part of the label is hidden behind the goban example.
I don’t know if it’s just me.
I see the same layout issue on Android/Brave.
Looks like a CSS bug.
I believe that this issue depends on the effective display width and occurs when the viewport width is less than 435 pixels.
I was able to replicate the issue on Windows/Chrome, while using the device simulator in the developer console to reduce the effective display width:
At 435 pixels and above, the layout seems fine:
Note that, for phones and tablets, this viewport width (effective pixel width) is almost always not the same as the actual pixel width of the screen. For example, my phone screen is actually 720x1600 pixels, however, since it is only about 6.5 inches, the browser sets an effective display size of 412x719, for the sake of laying out and scaling websites at a legible zoom level. Of course, the full pixel density is still utilized for rendering fonts, images, and other graphical elements.
You can find out your mobile browser viewport size via a website like: https://viewportsizer.com/