I need help about function "display: flex"

Hi everyone,
I have trouble with elements that I assigned display: flex command. I guess I don’t use it for the right item. I’m trying to do all descriptions is side by side with icons like in the free code camp’s product landing page example. Even I have tried it for all id and classes in section ‘Features.’ I couldn’t find where I am doing wrong. If you give me any suggestions about it, I would be so thankful.
There is my codeine link: https://codepen.io/totoromorin/pen/yLNpeJY?editors=1100

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