Submitted almost 3 years ago

QR code component solution using CSS Flex

Aaron Li•90

@aaronli722

A solution to the QR code component challenge

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Solution retrospective

Is there a common practice of the css properties order? for example, display comes first, then width/height, and then margin/padding, etc?
When to use class, when to use id?

In my concept, id is use when the element is unique, for example #card in this challenge. But when I studied the html code of other pages, I found that they may also use class to describe unique element. So when to use class, when to use id?

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