Personally, I think it looks better in black than when everything is in white. Still, maybe you should have a dark/light switch on the site. Your newest update requires people to only use the dark mode, and I don't see a button to change to the light version for those who prefer that.
I have also noticed the Register tab now. I don't think it was there before. What advantages are there for users who sign up to Fryx Finance? What's the difference between a registered and non-registered trade?
Noted, I'll add the option to select dark or light theme sometime in the future.
If you register an account, you can set limit orders on the order book, and withdraw after making several trades.
Without registering an account it does just one market order and then withdrawal.
The account is for more advanced traders, whereas not using account is for those who just want a single quick and convenient trade.