CSS follows a rule-based structure. Each rule consists of a selector and a declaration block. Each CSS rule comprises a selector and a declaration block, where selectors identify the HTML elements to style, and declaration blocks define the properties and their corresponding values.

General Syntax of CSS

selector {
    property: value;
}

Key Elements of CSS Syntax

• Selector: Specifies the HTML element(s) to target (e.g., h2, .class-name, #id-name).
• Declaration Block: Enclosed within curly braces {} and contains one or more property-value pairs.
• Property: Defines the style attribute to modify (e.g., color, background-color).
• Value: Sets the specific style for the property (e.g., blue, 5px).
• Semicolon (;): A critical component, required at the end of each property-value pair to separate multiple declarations within a block.

Example: Single Property Declaration

h2 {
    color: blue;
}

Within the declaration block, there can be multiple pairs of properties and values.

Example: Multiple Property Declarations

button {
    color: white;
    background-color: black;
    border: transparent;
    border-radius: 5px;
}

Here, button is the selector, and there are multiple pairs of properties and values. Each pair is separated by a semicolon ;.

Best Practices

• Always include a semicolon (;) after each property-value pair, even if it’s the last declaration in the block, to maintain consistency and avoid errors when adding new styles.
• Use clear and descriptive property names and values to enhance code readability and maintainability.