HTML 5 CSS nth-of-type

.box:nth-of-type(2) {
background: #E01B5D;
}
.box:nth-of-type(3) {
background: #30FFFF;
}
.box:nth-of-type(4) {
background: #B3FF30;
}
.box:nth-of-type(5) {
background: #308AFF;
}
.box:nth-of-type(6) {
background: #1BE059;
}