CSS | :nth-child() Selector

The :nth-child() selector in CSS is used to match the elements based on their position in a group of siblings. It matches every element that is the nth child.

Syntax:

:nth-child(number) {
    //CSS Property
}

Where number is the argument that represents the pattern for matching elements. It can be odd, even or in a functional notation.

odd: It represents elements whose position is odd in a series: 1, 3, 5, etc.
even: It represents the elements whose position is even in a series: 2, 4, 6, etc.
functional notation (<An+B>): It represents elements whose position of siblings matches the pattern An+B, for every positive integer or zero value of n.

Example-1: In this example every odd paragraph is selected. Formula used is 2n+1 i.e 1, 3, 5, etc paragraphs are selected.

<!DOCTYPE html> 
<html> 
    <head> 
        <title>CSS :nth-child Selector</title> 
        <style>  
            p:nth-child(2n+1) { 
              background: green; 
              color: white; 
            } 
        </style> 
    </head> 
    <body style = "text-align:center"> 
        <h1 style = "color:green;"> 
            GeeksforGeeks 
        </h1> 
        <h2> 
            CSS :nth-child Selector 
        </h2> 
      
        <p>A computer science portal for geeks.</p> 
        <p>Geeks classes an extensive classroom programme.</p> 
          
    </body> 
</html> 

Output:
nthchild
Example-2: In this example every even <li> is selected i.e. 2, 4, 6, etc.

<!DOCTYPE html> 
<html> 
    <head> 
        <title>CSS :nth-child Selector</title> 
        <style>  
        li { 
            width: 30%; 
        } 
            li:nth-child(even) { 
              background: green; 
              color: white; 
            } 
        </style> 
    </head> 
    <body style = "text-align:center"> 
        <h2> 
            CSS :nth-child Selector 
        </h2> 
        <p>Sorting Algorithms</p> 
        <ul> 
        <li>Quick sort.</li> 
        <li>Merge sort.</li> 
        <li>Insertion sort.</li> 
        <li>Selection sort.</li> 
          
        </ul> 
          
    </body> 
</html> 

Output:
nthchild

Supported Browsers: The browser supported by :nth-child() selector are listed below:

Apple Safari 3.2
Google Chrome 4.0
Firefox 3.5
Opera 9.6
Internet Explorer 9.0

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