responsive using flex

HTML:

• Every webpage needs a <main> that wraps all of the content, except for <header> and footer>. This is vital for accessibility, as it helps screen readers identify a page's "main" section. Wrap .container in a <main>.

• The alt text should be written naturally, without using - between the words. Write something short and descriptive, without including words like "image" or "photo". Screen readers start announcing images with "image", so an alt text of "image of qr code" would be read like this: "image, image of qr code". The alt text must also say where it leads(frontendmentor.io).

• .attribution should be a <footer>, and you should use <p> for the text inside.

CSS:

• Your CSS Reset lacks an essential declaration, which is usually the first one:

*,
*::before,
*::after {
  box-sizing: border-box;
}

• Add around 1rem of padding on the body, so the card doesn't touch the edges on small screens.

• On the body, change height to min-height: 100svh. Remove the margin.

• Remove the width on the card.

• Add a max-width of around 20rem on the card, to prevent it from getting too wide on larger screens.

• font-size must never be in px. This is a big accessibility issue, as it prevents the font size from scaling with the user's default setting in the browser. Use rem instead.

• Since all of the text should be centered, you only need to set text-align: center on the body, and remove it elsewhere. The children will inherit the value.

• You don't need to set a 100% max-width to images in your styling, as that is already done in your CSS Reset.

• As the design doesn't change, there is no need for any media queries. When you do need them, they should be in rem, not px.