Using Stylesheets

Introduction to Stylesheets

A stylesheet is a file or a form of code that is used to describe the layout and look of a document written in markup language.
Cascading Style Sheets (CSS) is the most commonly-used stylesheet language in web development.
CSS is used in conjunction with HTML and JavaScript to build web pages.

Importance of CSS Stylesheets

CSS allows web developers to control the presentation of multiple pages all at once.
With CSS, you can adjust the layout, colours, fonts, and animations on a website.
It can also enable a site to adapt its visual presentation to different devices, such as mobile phones, tablets, or computers.

Implementation of Stylesheets

CSS can be included internally in the head of an HTML document or externally as a separate file linked to the HTML document.
External stylesheets are more efficient as they can control multiple HTML elements across several pages at once.
Internal stylesheets can be used for single, standalone HTML pages.

CSS Syntax

CSS syntax consists of a set of rules.
These rules have two main parts: a selector, and one or more declarations.
The selector is usually the HTML element you want to style.
Each declaration includes a CSS property name and a value, separated by a colon.

For example:

body {
   background-color: lightblue;
}

In this CSS code, “body” is the selector and “background-color: lightblue;” is the declaration.

Understanding Selectors

CSS selectors are used to select the HTML elements you want to style.
Different types of selectors: Element selectors, Id selectors, Class selectors.
Element selectors select elements based on the element name.
Id selectors select elements based on their id attribute.
Class selectors select elements based on their class attribute.

Remember: Proper understanding and usage of CSS stylesheets will allow you to effectively control the visual presentation of your website across multiple platforms.