Use negative nth-child and nth-last-child

nth-child is used to choose a child or a range of children of a given element. Using negative nth-child will pick the first few children.
In the following example, the first three items will be underlined. The range of second to fifth items have the blue color.
li:nth-child(-n + 3) {
text-decoration: underline;
}
li:nth-child(n + 2):nth-child(-n + 5) {
color: #2563eb;
}
In a similar way, nagative nth-last-child will pick the last few children.
/* Add a decorative line to the last two items */
li:nth-last-child(-n + 2) {
text-decoration-line: line-through;
}

Demo

Use negative nth-child and nth-last-child

See also