:nth-child CSS Pseudo Class


The :nth-child pseudo-class is used to add style to elements based on the numbering in the element tree.


element:nth-child (odd | even | <number> | <expression>) {...}


  • oddAll odd item numbers.
  • evenAll even item numbers.
  • <number>The serial number of the child relative to its parent. Numbering starts with 1, this will be the first item in the list.
  • <expression>It is given in the form an ± b , where a and b are integers, and n is a counter that automatically takes the value 0, 1, 2 ...
If a is zero, then it is not written and the record is reduced to b. If b is zero, then it is also not specified and the expression is written in the form an. a and b can be negative numbers, in which case the plus sign changes to minus, for example: 5n-1.
By using negative values ​​of a and b, some results can also turn out to be negative or equal to zero. However, elements are affected only by positive values ​​due to the numbering of elements starting at 1.


table { 
width: 100%;
border-collapse: collapse;
border-spacing: 0;
tr:nth-child(2n) {
background: #a3ffa8;
tr:nth-child(1) {
background: #001aad;
color: #fff;

Browser Support

Explorer Edge Chrome Firefox Opera Safari
Tablets / Mobile
Android Chrome Firefox Opera Safari Samsung

Last updated by CSSPortal on: 25th November 2019