How to revise the code to make the picture 100%width on table and mobile version?

Hi Dudes,

In order to better my SEO, I'm learing HTML, CSS and JS, but not finished yet. Besides, I'm trying to use Markdown Editor to edit my blog in wordress.

And here is the thing, like the picture below, the featured image in the post is 40% width on the computer, but 100% width on the Tablet and Mobile version.

How to revise the code I've got on my hand to achieve this kind of style.

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