CSS (Cascading Style Sheets)

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A style sheet language used for describing the presentation of a document written in HTML or XML. Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in HTML or XML (including XML dialects such as SVG, MathML, etc.). It controls the layout, colors, fonts, and other visual aspects of a web page.

Basic Syntax:

selector {
  property: value;
}

Selectors:

  • Element Selector: Selects HTML elements by name.

    p {
      color: red;
    }
  • Class Selector: Selects elements with a specific class attribute.

    .highlight {
      background-color: yellow;
    }
  • ID Selector: Selects a single element with a specific id attribute.

    #main-header {
      font-size: 24px;
    }
  • Descendant Selector: Selects an element that is a descendant of another specified element.

    article p {
      line-height: 1.5;
    }

Box Model:

  • Margin: Space outside the border.
  • Border: Border around the padding and content.
  • Padding: Space between the content and the border.
  • Content: The actual content of the box.

Example:

/* Styles for a simple box */
.box {
  width: 200px;
  height: 200px;
  background-color: #f0f0f0;
  border: 1px solid #ccc;
  padding: 20px;
  margin: 20px;
  text-align: center;
}

/* Styles for a class */
.button {
  display: inline-block;
  padding: 10px 20px;
  background-color: #007bff;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}

/* Styles for an ID */
#header {
  font-size: 24px;
  font-weight: bold;
  text-align: center;
  color: #333;
}