Responsive blog preview card with hover transition animation

What challenges did you encounter, and how did you overcome them?

I want to self justify one of my flexbox item. Turn out I can't use it on flex, I can use it on grid. Instead I use margin auto to solve this. If you want the detail, I recommend you to check my readme.md on my github of this solution

What specific areas of your project would you like help with?

Is my semantic good enough or I got it wrong? Any help on it appreciated.