html style settings

HTML styling is an important part of creating a web design. HTML styles can adjust various aspects such as layout, color, font size and style, as well as achieve interactive special effects. This article will introduce the basic knowledge of HTML styling, from writing CSS style sheets to applying CSS styles in HTML elements, helping readers achieve their web design goals.

1. CSS Style Sheets

CSS refers to Cascading Style Sheets, which was proposed to solve the problem of confusion in HTML documents due to the lack of separation of presentation and content. of. CSS style sheets can be used to control the appearance of HTML elements by defining class, ID and tag selectors and other selectors to change the color, background, font size, line height, width, height and margins of HTML elements. Several common CSS style sheet operations will be introduced below.

1. How to create CSS files

We usually save the style sheet file as a CSS file, and the suffix of the file is .css. Here are the steps to create a style sheet file:

• Create a text file by opening Notepad or other software that supports text editing.
• Add the code of the style sheet on the first line of the file, namely the "
• Add CSS style sheet code between tags, which can be selectors such as classes, IDs, and tags, and other CSS style attributes.
• In the CSS file, there should be a curly bracket between each selector and its corresponding style attribute to indicate the relationship.
• After completing the definition of CSS styles, we should save the CSS file as a .css file and link it to the HTML document.

2. CSS style sheet comments

The role of CSS style sheet comments is to facilitate developers to explain and describe when maintaining code. CSS style sheet comments start with / and end with /. The following example:

/*This is a line of comments
This is the second line of comments*/

3. Basic operations of CSS style sheets

CSS The writing of style sheets is based on the basic operations of selectors and attributes, such as:

• Selectors: CSS style sheets use specific symbols to select HTML elements to be modified, such as class selectors ("." ) and ID selector ("#"), etc.
• Attributes: CSS style sheets use attributes to define the style of HTML elements, such as "font-size", "color" and "background" attributes.

The following code demonstrates a basic HTML element style adjustment, which is the title:

< ;head>

<title>CSS样式表调整标题样式的例子</title>
<style>
    h1 {
        color: red;
        font-size: 36px;
        background: yellow;
    }
</style>

<h1 id="这是一级标题">这是一级标题</h1>

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