CSS selector for other than the first child and last child
Solution 1:
Try:
#navigation ul li:not(:first-child):not(:last-child) {
...
}
Solution 2:
Sure it will work, you just have to use two 'not' selectors.
#navigation ul li:not(:first-child):not(:last-child) {
It will continue down the line after the first one, saying "not the first child" and "not the last child".