css before last child code example

Example 1: css last child

li:last-child {
    background-color: lime;
}

Example 2: css last 3 childs

#something a:nth-last-child(-n+3) {
    /*declarations*/
}

Example 3: selecting last child css

p:last-child {
  font-size: 0.75em;
}

Example 4: css last child with class

/*This will only work if the last child of someEID has 
the class .myclassName 
if the last child does not have class name us js*/
#someEID .myClassName:last-child {
    background: blue;
}