fix a bug in feature.css

[Ishhha]

Please describe the problem (or idea)

What happened just before the problem occurred? Or what problem could this idea solve?

Please show us where to look

https://publiclab.org/plots2/app/assets/stylesheets/feature.css

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[Ishhha]

@TildaDares Can u please check and tell whether I work on this issue or not?

[TildaDares]

Hi @Ishhha, you can make a first-timers issue from this since it’s a small change. Thanks!

[TildaDares]

This has been marked as a good candidate for becoming a first-timers-only issue like these, meaning that it's simple, self-contained, and with some extra formatting✍️, could be a great entry point for a new contributor. If you're familiar enough with this code, please consider reformatting it as a first-timers-only issue, and then ping @publiclab/reviewers to get it labelled🏷. Or, if this is not your first time, try to solve it yourself🧑‍💻!

[Ishhha]

Okay I'll solve this issue. Thank you for guiding me @TildaDares. ☺️

[Ishhha]

Hello, @TildaDares, I make a PR on this issue, Can u please go through with it? If u find any mistakes, please let me know :)