Node Category Background

Follow these steps :

1. Go to ACP and search for "extra.less"
2. Add code below

Code:

/* Coloured Node Categories */
.block.block--category.block--categoryXXX(Node ID instead xxx) .block-header {
    background: #009ACF;
    color: #ffffff;
}
/**********/

source https://xfworld.net/threads/node-category-background.43689/