QR code page using Flexbox

Ok, lets break this down into HTML and CSS, HTML first

• Every site must have a <main> element, which contains all the main content for the page, but excludes content that repeats across multiple pages, such as the site header, footer and main navigation.
  • As this is is a single component challenge, and doesn't have any headers, the whole component should be inside <main>. You have a div with a class of main, but a div on its own is not a semantic element, so replace that with <main>
• You have unnecessary elements. This challenge only really needs (inside of <main>) a single div for the card component itself, and then an <img> a <h2> and a <p> inside that. All the extra wrapping divs are unnecessary and cause extra noise and styling difficulties
  • Always try and use the minimum number of elements, only add any extra ones if you really need them
• the <br> is especially unnecessary because it's causing the styles to break too. There's almost never a need to use the <br> element and definitely not in this challenge

Now the CSS

• The main problem here is inappropriate units. You generally want to avoid vh or vw as it gives you very little control. For instance what does 83vh mean? 83% of the height of the screen - but how high is that? Your screen is likely different to mine, everyone's is different. So is that an appropriate size? Unlikely
  • The best thing to do is not provide a size at all. The browser will calculate sizes automatically, and they will always be responsive. This is the case for heights. You never want to specify a height. What would happen if a content editor decided the paragraph was going to be twice as long? Your component would now be too short and would break. So, instead, always let the browser calculate height.
• But, sometimes we have to give some indication of size to match the design. Here, if we didn't do something about the width, the component would stretch the whole width of the screen. And on large screens we don't want that. But, we shouldn't set width - again, if we set a value for that, but the user's screen is smaller, the component will overflow the screen and break.
  • So, instead set a max-width (and make sure it's in rem). That way, the component doesn't get too big on large screens, but can still shrink smaller on small ones
• Centering the component on the screen. You've almost got that right - you have display: flex; align-items: center; justify-content: center; - that's good. That gets your component centered horizontally. And it would center it vertically too, but you'll notice it didn't, and so you've tried to correct for that with some top margin. But, that was the wrong fix
  • The reason it wasn't centered vertically is because the height of the page only takes up as much space as it needs for the content, so there's no extra height for it to center in. So, you need to increase the height somehow. This is one of the only use cases for vh units. You need the page to be at least 100vh. So set min-height: 100vh on <main>. But make sure it's min-height not height. Otherwise, content may get cut off on very small screens. You want the height to be able to expand bigger than the screen if it needs to
• Font size. This must never be in px. Users must be allowed to change the browser font-size in their settings. Many people need larger fonts to make it easier to read. If you set fonts in px you remove their ability to do this. So, instead always use rem
• Always use a CSS reset at the start of your CSS. There are a few browser defaults that are unhelpful when styling sites. A rest will correct some of these to more sensible values. Particularly for images. You can use this one https://www.joshwcomeau.com/css/custom-css-reset/
• The difference between margin and padding. Margin is for a space between one element and its sibling. Padding is for the space between the border of an element and its children.
  • So, the gap between the heading and the paragraph should be margin, not padding
  • And the card container should have some padding (because right now, the text can touch the edge of the card, and it shouldn't)

Very nice. You might be able to correct the background by setting it on the container and not on the H2 / P.

All the best

No the html is not semantic at all. -They can use the various html elements eg.main element to show that the QR code section is the main part of the page. The code is not accessible at all - They can add the various roles for the elements too. The code is not well structured I feel that there are many areas that the person has added too many divs which are just unneccesary. The solution differs considerably from the design.