Responsive 3 Column Preview Card made with Mobile First Workflow

I honestly don't really have many questions. The solution looks solid to me and works well when switching to smaller screen sizes.

The only thing that I would like feedback on is the layout of my HTML. Currently I'm using a <section> element with a <header> element inside for the icon, <h1> for the title, <p> for the little paragraph of text and a link for the button. Is this good practice?