3 background-image: none;
6 .button:nth-child(even) {
7 background-color: yellow;
10 .button:nth-child(odd) {
11 background-color: red;
14 .button:nth-child(first) {
15 background-color: purple;
18 .button:nth-child(last):nth-child(even) {
19 background-color: green;
22 .button:nth-child(last):nth-child(odd) {
23 background-color: purple;
26 .button:nth-child(last):nth-child(first) {
27 background-color: blue;
33 background-color: red;
37 background-color: green;
41 background-color: purple;
45 background-color: yellow;
49 background-color: blue;