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I think I spent too much time with the form validation in JavaScript. Does anyone recommend a specific form, or form validation library that goes well in React apps?

Without using libraries, is there a better way to add custom styling the the "unread" posts? I used a css class and then removed the class with JS when the button was clicked.

There is a thin, white border around the card even though I set the border-color to be transparent... Not sure why. Thank you for taking the time