My first "mobile-first responsive" page [p1xt's web with CS guide]

hello everyone!

just wanted to know what you guys think about my template clone, the template is a part of p1xt’s “Web Development with Computer Science Foundations” guide, this is my first time trying to build a mobile-first responsive web page, i didn’t use bootstrap or any CSS framework, i just used a few media queries and a bit of jquery.

original design: here
my clone: BAM!