HTML5, CSS, Flexbox

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 the card in a <main>.

• You don't need to wrap every element in the card in a <div>.

• The alt text must also say where it leads(frontendmentor website). Do not include words like "image" or "photo", as screen readers automatically announce it as an image. A good alt text would be "QR code leading to the Frontend Mentor website."

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

CSS:

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

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

• Remember to specify a fallback font:font-family: 'Outfit', sans-serif;.

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

• On the card, remove position, transform, max-width, max-height and overflow.

• To center the card horizontally and vertically, with some space between the main and the footer, I would use Flexbox on the body:

display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
min-height: 100svh;
gap: 2rem;

• Remove all widths and heights in px. Setting a fixed size is the number one reason for responsive issues.

• 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.

• letter-spacing must also never be in px. I would use em.

• 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.

• Remove font-family on the heading. When you set it on body, its descendants inherit the font.

• To create the space between the image and the edge of the card, set padding on all 4 sides of the card: padding: 1rem.

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