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css3-altCSS

CSS (Cascading Style Sheets) is a language used to control the appearance and layout of web pages. While HTML defines the structure of a webpage (like headings, paragraphs, and links), CSS is used to make it look nice by controlling things like colors, fonts, and spacing.

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How CSS Works:

CSS is made up of rules that tell the browser how to style elements of the page. Each rule has two parts:

  1. Selector: The part of the page you want to style (like a heading or paragraph).

  2. Declarations: The styles you want to apply, written inside curly braces {}. Each declaration has a property (like color) and a value (like red).

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Example of CSS:

<!DOCTYPE html>
<html>
  <head>
    <style>
      body {
        background-color: lightblue;
      }
      h1 {
        color: navy;
        font-size: 36px;
      }
      p {
        font-family: Arial, sans-serif;
        color: darkgray;
      }
    </style>
  </head>
  <body>
    <h1>Hello, world!</h1>
    <p>This is my first styled web page.</p>
  </body>
</html>

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Breaking It Down:

  • body { background-color: lightblue; }: This changes the background color of the entire webpage to light blue.

  • h1 { color: navy; font-size: 36px; }: This makes the heading (h1) text dark blue and larger in size.

  • p { font-family: Arial, sans-serif; color: darkgray; }: This changes the font of the paragraph to Arial and makes the text color dark gray.

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CSS can be added to a web page in 3 ways:

  1. Inline CSS: Styles are added directly within HTML tags. Example: <p style="color: red;">This is a paragraph.</p>.

  2. Internal CSS: Styles are included within a <style> tag in the <head> section of an HTML document (as shown in the example above).

  3. External CSS: A separate CSS file (e.g., styles.css) is linked to the HTML document, making it easier to style multiple pages consistently.

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Example of External CSS:

In the HTML file:

In the styles.css file:

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Key CSS Properties:

  • Color: Defines the color of text. Example: color: red;

  • Font: Controls font type and size. Example: font-size: 20px; font-family: Arial;

  • Background: Changes the background color or image. Example: background-color: yellow;

  • Margin and Padding: Control spacing around elements. Example: margin: 10px; padding: 5px;

CSS helps make websites more visually appealing and user-friendly. By separating content (HTML) from design (CSS), developers can easily update the look of a site without changing its structure.

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