CSS (Cascading Style Sheets) style is an essential technology for front-end development. It can control the layout, fonts, colors and other styles of web pages to achieve the unification of web page styles. This article will focus on how to write CSS styles to help readers understand and apply CSS more deeply.
1. Embedded style sheet
Embedded style sheet is a way to write CSS styles directly in HTML code. Use the
<head>
<style>
body {
background-color: #f2f2f2;
color: #262626;
}
h1 {
font-size: 36px;
font-weight: bold;
}
</style>
</head>In the above example, the background color of the body element is #f2f2f2, the text color is #262626, and the font size of the h1 element is 36 pixels, which is displayed in bold.
2. External style sheet
External style sheet is a way to write CSS styles separately in an external CSS file. Use the tag in the
<head>
<link rel="stylesheet" href="style.css">
</head>style.css file is:
body {
background-color: #f2f2f2;
color: #262626;
}
h1 {
font-size: 36px;
font-weight: bold;
}In this way, all elements in HTML can obtain style information from external style sheets, achieving clearer and more concise HTML code. .
3. Inline style
Inline style is a way to write CSS styles directly in the style attribute of the HTML tag. For example:
<h1 id="Hello-world">Hello, world!</h1>
In the above example, the font color of the h1 element is red and the font size is 36 pixels.
4. CSS Selector
CSS selector is a mechanism used to select HTML elements and apply styles. It can locate elements based on their name, class name, ID and other attributes, and inherit or override their corresponding CSS styles. The following are common uses of CSS selectors:
- Tag selector: Locate elements and apply styles by their tag names. For example:
h1 {
color: red;
}- Class selector: Locate the element and apply the style through the element's class attribute. For example:
.red {
color: red;
}In the HTML code, set the class attribute of the element that needs to be styled to "red" to achieve a red font color.
- ID selector: Locate elements and apply styles through their ID attributes. In the HTML code, set the ID attribute of the element to which the style needs to be applied to "id" to achieve the style effect. For example:
#header {
background-color: #f2f2f2;
}In the above example, the ID of the element is "header", and the effect of the background color being #f2f2f2 is achieved.
- Attribute selector: Locate elements and apply styles based on their attribute values. For example:
input[type="text"] {
border: 1px solid #ccc;
}In the above example, the borders of all input elements whose type attribute value is "text" are 1 pixel thick solid gray line.
- Descendant selector: Locate elements and apply styles through their parent-child relationship. For example:
div p {
color: #262626;
}In the above example, the font color of all p elements within the div element is #262626.
The above are common ways of writing CSS selectors. Their flexible application can realize tedious style adjustments and make the layout, fonts, colors, etc. of the web page more beautiful.
5. Summary
This article introduces common writing methods such as embedded style sheets, external style sheets, inline styles, and CSS selectors for CSS styles. They can help developers achieve the unification of web page styles and create Produce a more beautiful and comfortable user experience. In actual development, it is necessary to choose a suitable CSS style writing method according to specific needs to improve the readability and maintainability of the code.
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