affecting the last child with pseudo code css code example

Example 1: apply css on last child in parent div

.parent > *:last-child {
  background-color: red;
}

Example 2: 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;
}