Custom Field type for highlighting text not showing color

my question about Custom Field type for highlighting text.  as per following document  am make all the required files are created

https://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_8.0/Cookbook/Creating_Custom_Fields/ 

my problem is all other things working perfectly except color not taken. I troubleshooted the instance custom/clients/base/fields/Highlightfield/detail.hbs file not taking the output. and it take hbs content from clients\base\fields\base\detail.hbs.