QR code component

HTML:

• I would remove .container, as it is not needed.

• The alt text should be written naturally, without using - between the words. The alt text must also say where it leads(the frontendmentor website). A good alt text would be "QR code leading to the Frontend Mentor website."

• Headings should always be in order, so you never start with a <h3>. Change it into a <h2>. As the card heading would likely not be the main heading on a page, I would change it to a <h2>.

CSS:

• Including a CSS Reset at the top is good practice.

• I like to add 1rem of padding on the body, to ensure the card doesn't touch the edges on small screens.

• On the body, change height to min-height - this way, the content will not get cut off if it grows beneath the viewport.

• Remove all widths.

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

• On the image, add display: block and max-width: 100% - the max-width prevents it from overflowing its container.

• As the design doesn't change, there is no need for any media queries. When you do need them, they should be in rem or em, not px. Also, it is common practice to do mobile styles first and use media queries for larger screens.