Survey Form, input border change color on click

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#1

I’m doing the Survey Form and I noticed that clicking the input fields the border color change, but I didn’t understand how to do it

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Challenge: Build a Survey Form

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#2

I’m guessing you mean the sample project.
What have you tried?

#3

Yes, sorry.
I tried :focus and change the border color but doesn’t work.

#4

Without seeing your code all I can do is guess. Please provide a link to your project.