CSS is the abbreviation of Cascading Style Sheets. It is a language used to describe the style and layout of documents such as HTML or XML. CSS allows us to separate the appearance and style of a web page from its content and structure and give us greater control over them.
The basic structure of CSS includes selectors, attributes and values. The selector is used to select the HTML element to which the rule applies, the attribute is used to describe the style of the selected element or modify its behavior, and the value defines the specific value of the attribute.
When learning CSS, the first step is to understand the different types of selectors that can be used to select different HTML elements. For example, a tag selector can use the tag name to select elements, a class selector can use the "." symbol followed by the class name to select elements, an ID selector can use the "#" symbol followed by the ID name to select elements, and an attribute selector can use Element properties select elements.
These selectors can be used individually or in combination to create appropriate document structure. Generally speaking, class selectors are more suitable for selecting multiple elements to display the same style definition, while ID selectors are suitable for unique identification of a single element.
The next step is to learn and use attributes and values. Select appropriate attributes to control the style of elements according to actual needs, such as background-color (background color), font-size (font size), etc. The value is the parameter of the attribute. For example, the value of background-color can be set to red, blue, etc.
Before applying CSS styles to HTML documents, you need to create a style sheet. Style sheets can be included in the
