CSS can select HTML elements by their tag, class, and ID. CSS classes and IDs have different purposes, which can affect which one you use to style HTML elements.

CSS classes are meant to be reused over many elements. By writing CSS classes, you can style elements in a variety of ways by mixing classes on HTML elements.

For instance, imagine a page with two headlines. One headline needs to be bold and blue, and the other needs to be bold and green. Instead of writing separate CSS rules for each headline that repeat each other’s code, it’s better to write a .bold CSS rule, a .green CSS rule, and a .blue CSS rule. Then you can give one headline the bold green classes, and the other the bold blue classes.

While classes are meant to be used many times, an ID is meant to style only one element. As we’ll learn in the next exercise, IDs override the styles of tags and classes. Since IDs override class and tag styles, they should be used sparingly and only on elements that need to always appear the same.



On line 13 of index.html, there’s an element that displays the time the article on the page was published.

Add a class attribute, with a class of publish-time.


Add a publish-time class selector in style.css and make its text color gray by writing this within the CSS rule’s body:

color: gray;

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