Responsive Sass, Pug and Webpack

Hey @tin-pham 👋🏻

• In your markup, <section class="container center">...</section> should be <main class="container center">...</main> and this will fix the accessibility issues. Just, don't forget to generate a new repot once you fix the issues.
• For the music icon, add aria-hidden="true”, because it's for decoration. You can read more about aria-hidden here.
• Also, I suggest adding transition: all 0.2s; to the button and the links, this will make :hover smoother.

I hope this was helpful 👨🏻‍💻 Other than that, you did a great job, nicely done. Cheers 👾