层叠样式表，简称CSS，用于在我们的网站上应用样式。使用CSS使我们更容易使网站呈现出色。它将结构（由HTML文档构成）与呈现分离，呈现部分是用户看到和与之交互的部分。
为什么我们需要CSS来进行页面展示
Having a different and creative style has become a must have property for a website, as it makes the website fun to interact with, instead of a plain and dull looking website which can be made using only HTML.
有三种方式可以将CSS应用到我们的网站中：
-
内联样式− 当我们将样式应用于每个单独的HTML标签时，这被称为内联样式。
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An example of inline styling in CSS is given below.
<h1 style=”font-size: larger”> This is an example of using inline styling in CSS </h1>
Embedded styling − When the style tag is nested inside the head tag, making it such that the CSS seems embedded inside an HTML file. Then it is referred to as Embedded styling.
Example
<!DOCTYPE html>
<html lang="en">
<head>
<title>Embedded Styling</title>
<style>
h1 {
color: aquamarine;
}
</style>
</head>
<body>
<h1>This is an example of embedded styling being used in HTML.</h1>
</body>
</html>
外部样式 - 这是使用CSS的最推荐的方法，它通过使用包含所有样式信息的.CSS文件将CSS与HTML分离，并将其链接到HTML文档。我们可以使用这种样式方法附加多个CSS文件。
使用外部CSS样式的示例如下所示。
<head> <link rel=”stylesheet” href=”style.css”> </head>
在CSS之前是什么？
在CSS出现之前，HTML引入了像或color属性这样的标签，用于样式化目的。但是，将字体和颜色信息添加到每个页面的大型网站的过程耗时且昂贵。这就是为什么引入了CSS，它消除了使用这些奇怪标签的HTML格式。
The introduction of CSS separated the structure and styling, where HTML was used for structuring the web page while CSS focused on incorporating style and presentation in the webpage.
CSS的优势和易维护性
正如我们已经知道的那样，CSS为我们提供了简单的格式选项来改善网页的呈现。但这还不是它的全部。使用CSS的主要优势如下所列。
For simple websites, we can use CSS inside the HTML document, while for a large website we can create separate CSS files. This provides us the choice as to which form of CSS should we use depending on our website.
它拥有更好的社区支持。
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以前我们必须为每个网页单独指定字体、颜色等，但是CSS的引入使得这个复杂而冗长的过程变得更加简单。
我们可以通过使用CSS文件而不是将其整合到文档本身中，将错误检测和纠正变得简单，从而节省时间。更新一个文件可以更新我们网站中的所有样式信息。
It makes the process of loading the web page fast as we are only applying rules and styles to each tag only once as compared to HTML formatting where we had to use tags like etc. for styling. Less code makes the download time for the document much less, which implies faster page load.
它还提供了更容易维护，因为它使格式化成为全局的，可以通过修改全局格式化的样式来进行修改。我们不再需要为每个元素分别在每个页面上修改格式和样式。
我们可以使用CSS适配多种设备，因为它几乎兼容所有可能的设备。这种多设备兼容性使其在现代计算领域具有巨大优势。
Due to its simplicity and popularity, it has now become a skill that is required for every web developer. Designing a website creatively is what makes your website stand out from others and CSS is the language that provides us with the ability to do so.
它完全转变了沉闷和平淡的网站，使其成为一个时尚和吸引人的网站，能够吸引用户的注意力，并使他们与网站互动变得有趣，而仅仅使用HTML是不可能实现的。
Increased user experience by giving the ability create wonderful UI which helps the users to navigate the website easily by eliminating the complexity of the rigid design of HTML.
It is needed by every web developer to give life to their designs.
Platform independence is consistently provided by the Script, which also works with the most recent browsers.
The term "cascading" implies that we can employ multiple styles, with local styles predominating. The local style assignment might take the place of the global style declaration.
These advantages are enough to explain the ease of maintenance that CSS provides. Along with these, we can also use CSS to create a responsive website(using media queries), which is an emerging requirement for modern websites. Without CSS, web creation is not feasible. CSS may initially seem challenging, but after a few ideas are understood, CSS will feel incredibly straightforward and uncomplicated.
Conclusion
总之，CSS是实现可维护网站的强大工具。这使得开发人员能够快速轻松地进行更改，而无需重写大量代码或担心兼容性问题。此外，CSS提供了在多个页面中重用样式的能力，减少了开发和维护时间，并确保网站的一致性。总的来说，CSS是一种强大而廉价的方式，可以使您的网站在长期内更易于维护。
