# CSS Basics ## Introduction This again should represent a review from what you've already covered in the [Foundations Lesson on HTML/CSS](https://www.learnhowtocodebook.com/foundations/frontend/html-and-css), but if you're unable to answer the questions posed below in the "Learning Outcomes" section, you could probably benefit from the review of the basic stuff. ## Learning outcomes * What are selectors? * In general, how specific should you be when targeting elements using selectors? * What's the difference between using `%`, `em` and `rem` to specify sizes? * How do you select an element inside another element? * How can you shorten up a long batch of CSS that's doing the same thing to many different elements by putting them all in one line? * How do you target the immediate child of an element? * How do you target a class inside a class? * How do you target a class inside an ID? * How would you target "all the links inside `li` elements that have the class `bunny` which are inside the unordered list with the id `things-that-hop`"? * What are the three ways to include CSS in your project? * How do you import an external stylesheet? * What is the browser's default stylesheet? * What is a "CSS Reset" file and why is it helpful? * Which stylesheet has preference if you import multiple ones and there are overlapping styles? * What is the order of priority of selectors (e.g. if you specify that the `` has color `black` but `

` tags have the color `blue` but class `main-title` has the color `red`, which will be used by `

Howdy!

`?) ## Assignment 1. Read [Shay Howe on the Basics of HTML/CSS](https://learn.shayhowe.com/html-css/getting-to-know-css/). 2. Read [CSS Tricks on Attribute Selectors](https://css-tricks.com/attribute-selectors/). ## Additional resources This section contains helpful links to other content. It isn't required, so consider it supplemental for if you need to dive deeper into something. * [Learn CSS Selectors Interactively Using CSS Diner](http://flukeout.github.io/) * [Smashing Magazine on Taming Advanced CSS Selectors](http://coding.smashingmagazine.com/2009/08/17/taming-advanced-css-selectors/) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://howtocode.trek.io/topics/deep-dives/html-css/css-basics.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.