3 column preview component using CSS

Hi again Alireza!!!

You have done this challenge very well, congrats 🎉👍🏻

I will give you some tips for your next frontend project 💡:

• To center elements with flexbox put min-height: 100vh; in the .header and don't forget to put align-items: center; to center perfectly the elements.

• I recomend to you to put a transition in the <button></button> elements. Like this: .btn{ transition: background-color .5s; }

That's all, and have a nice coding ⌨️

Tux3er liked your code 🐧👍🏻😉