CSS Definition What are cascading style sheets CSS?

CSS Definition What are cascading style sheets CSS?

CSS contains rules and values that a web browser can then apply to the content of the webpage in order to correctly display its content. For example, you can use CSS to define that the body section of the page has a blue background, and that the text is displayed in white Helvetica font with a size of 18px. In contrast, website builders that use What You See is What You Get (WYSIWYG) software do not require the user to enter any description code – it’s all built in to the platform. CSS is a style sheet language used for formatting content in HTML webpages.

  • Browsers, like Firefox, Chrome, or Edge, are designed to present documents visually, for example, on a computer screen, projector, or printer.
  • We can use it to check if a feature is supported by the browser using the @supports keyword.
  • This era saw inconsistent CSS support across browsers, leading to the need for complex workarounds to achieve consistent designs.
  • By default every item has order 0 and the appearance in the HTML determines the final order.

The background-color property, on the other hand, makes little sense to be inherited. Suppose we have a p element on the page, and we want to display the words into it using the yellow color. Semicolons are not optional, except after the last rule.

CSS Selectors

We can go one step further and move our elements in a 3D space instead of in a 2D space. With 3D, we are adding another axis, Z, which adds depth to our visuals. Transforms allow you to translate, rotate, scale, and skew elements, in the 2D or 3D space. They are a very cool CSS feature, especially when combined with animations.

css definition

In the past we used to float the sidebar to the left, for example, to show it on the left side of the screen and added some margin to the main content. You can try and add any of the properties I mentioned before (top, right, bottom, left) to .box, and nothing will happen. Static positioned elements are displayed in the normal page flow. In this section we’ll also see how things change on a page based on how elements with different position interact with each other. You can change this behavior by setting the box-sizing property. Margin is a shorthand to specify multiple margins at the same time, and depending on the number of values entered, it behaves differently.


With the basics of the CSS language covered, the next CSS topic for you to concentrate on is styling text — one of the most common things you’ll do with CSS. Here we look at text styling fundamentals, including setting font, boldness, italics, line and letter spacing, drop shadows, and other text features. We round off the module by looking at applying custom fonts to your page, and styling lists and links. This module provides a gentle beginning to your path towards CSS mastery with the basics of how it works, what the syntax looks like, and how you can start using it to add styling to HTML. Specificity refers to the relative weights of various rules.[17] It determines which styles apply to an element when more than one rule could apply.

css definition

Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation.Portions of this content are ©1998–2023 by individual mozilla.org contributors. The browser support status is shown on every MDN CSS property page https://deveducation.com/ in a table named “Browser compatibility”. Consult the information in that table to check if the property can be used on your website. For an example, see the browser compatibility table for the CSS font-family property.

CSS Grid Layout

Flexbox techniques to center vertically and horizontally can be combined to completely center an element in the page. Any what does css do for a web page element inside #mysection will be vertically centered. Any element inside #mysection will be horizontally centered.

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