Four Card Feature Section Using Flexbox

Actually, The main Design was pretty simple. The challenge was in making the layout responsive for various screen sizes. Here I followed the usual way, the way I used to do things(i.e, Desktop First). This made me realize that a lot of code is repeated and is probably not the best way. From next challenge onwards, I will be using the mobile First Workflow, and maybe redo this later

Any advice about making responsive layouts(specifically) or any other advice apart from that is appreciated

Thank you