great work! i don't have much advice but i host my own bookmarking service that has a similar pinboard-like interface, it's called espial, and you can see it in action here i use it all the time. these services are very useful!
for the custom css, the only advice i can offer is that maybe poking around with inspect element in your browser and then looking into the service's files and seeing if you can find the css file it's pulling from and then editing that? i've had luck with that on other services i host, though it's a little complicated and janky this way.
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for the custom css, the only advice i can offer is that maybe poking around with inspect element in your browser and then looking into the service's files and seeing if you can find the css file it's pulling from and then editing that? i've had luck with that on other services i host, though it's a little complicated and janky this way.