Duplicate Bootstrap css

[skiabox]

Hello guys.
I am new to Next.js and I am reading this tutorial (https://strapi.io/blog/nextjs-react-hooks-strapi-food-app-1).
So I have a question on it.
The author is injecting bootstrap minified css two times.
One at Layout.js and the second one inside _app.js
Is it some kind of mistake or not?
Thank you very much!

[jamesmosier]

You're correct, it should only be in there once. Although it would be possible to use the key property to ensure no duplicate tags are rendered, per the docs. But in this case the <link /> tag will import bootstrap css twice.

[skiabox]

Thank you very much sir for confirming my suspicions on this!