QR Code component using basic CSS

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 the "main" section of a page. Change .content to a <main>.

• The alt text must also say where it leads(frontendmentor.io).

• "Improve your" is a heading, so change it to a <h1>.

• .attribution should be a <footer>, and its text must be wrapped in a <p>.

CSS:

• It's good practice to include a CSS Reset at the top.

• Use the style guide to find the correct background-color.

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

• Remove the margin on the card.

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

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

• Remove all widths.

• 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 bad for accessibility, 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.

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