Hello everyone, and welcome to this section of the CSS tutorial. I'm Lao Zhao at the front end! Today we will introduce the concept and role of the CSS box model. The CSS box model is a very important concept in our page layout, which can help us better control the size and position of elements. In this lesson, we'll learn what the CSS box model is, its components, and how to use it for layout.
Before we start, let's review the basic concepts of HTML and CSS. HTML is responsible for describing the structure and content of the page, while CSS is used to control the style and layout of the page. When doing page layout, we usually need to consider the size, position and relationship between elements. The CSS box model is a very important concept to help us accomplish these tasks.
Now let's take a look at the sample code for the CSS box model.
First, we define a div element in HTML and set its class name to box. Next, in CSS, we give the .box a width and a height. The width and height are actually the basic properties of the box model.
markup
<div class="box"></div>CSS
.box { width: 200px; height: 100px; }The box model is actually made up of four parts: the content area, padding, borders, and margins. These four parts form a box around the element, and we can use CSS to control these four parts individually.