QR Code Component

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. Change the first <section> to a <main>. The second <section> can be a <div>.

• 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(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>. I would make it a <h2> - a page should only have one <h1>, reserved for the main heading. As this is a card heading, it would likely not be the main heading on a page with several components.

CSS:

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

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

• Remove the margin on the card.

• To center the card horizontally and vertically, I would use Flexbox on the body:

display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
min-height: 100svh;

• Remove the width and height in px on the card. We rarely want to give a component a fixed size, as we want it to grow and shrink according to the screen size.

• We do want to limit the width of the card, so it doesn't get too wide on larger screens. To solve this issue, give the card a max-width of around 20rem.

• 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.

• Likewise, move font-family: 'Outfit', sans-serif; to body, and remove it anywhere else.

• On the image, add display: block and change width to max-width: 100% - the max-width prevents it from overflowing its container. Without this, an image would overflow if its intrinsic size is wider than the container. max-width: 100% makes the image shrink to fit inside its container.

• Selectors like section img increase the specificity, making them harder to override. Instead, it's recommended to give elements one or more classes and use these as selectors.