What is CSS and what functions does it offer?

Cascading Style Sheets (CSS) is a style sheet language used to design and format the appearance of HTML or XML documents. CSS enables the separation of content and presentation by allowing developers to define the layout, colors, fonts and other visual properties of a web page without changing the HTML code itself. This facilitates the maintenance, consistency and customizability of websites. Here are some important concepts and features of CSS:

  1. Selectors: CSS uses selectors to select HTML elements to which styles are to be assigned. For example, the selector "p" can be applied to all paragraphs in a document.
  2. Properties: CSS defines various properties that influence the appearance of elements, such as "color" for the text color, "font-size" for the font size and "margin" for the spacing around an element.
  3. Values: Each property in CSS can have one or more values. For example, the "color" property can have the value "red" or "#FF0000".
  4. Declarations: In CSS, styles are defined in so-called declarations. A declaration consists of a property and a value, which are separated by a colon and ended by a semicolon. For example: "color: blue;".
  5. Cascading: The "cascading" in CSS stands for the hierarchy in which styles are applied to elements. CSS rules can come from different sources, such as external stylesheets, internal styles or inline styles, and they are applied in a specific order, with priorities and specificity playing a role.
  6. Selectors and combinators: CSS offers various selectors and combinators to select more specific or more comprehensive elements. For example, you can use the class selector (.class) to select all elements with a specific CSS class.
  7. Media queries: CSS makes it possible to adapt the layout and design based on the properties of the display device, e.g. screen size, resolution and orientation.
  8. Pseudo-classes and pseudo-elements: You can use pseudo-classes (e.g. :hover for the mouse pointer) and pseudo-elements (e.g. ::before and ::after) to stylize certain states or parts of elements.
  9. External stylesheets: It is possible to save CSS rules in external stylesheets files, which can then be used on multiple pages of a website. This promotes the consistency and maintainability of the design.

CSS is a fundamental part of modern web design and enables the creation of appealing and well-designed websites. Developers and designers use CSS to customize the appearance of websites and ensure that they display correctly on different screen sizes and devices. CSS is constantly evolving to meet the demands of modern web design.

CSS (Cascading Style Sheets) - Projects

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