I made filter section as attached image.
CSS can work when mouse over filter button.
But when I click it and move out mouse, Background-color will go back to normal.
How can I keep it ?
I see there is "cheked" code. But I could not figure out how can I use it.
Thank you for contacting Toolset support. In View >> Custom Search Settings >> you are using “Show only available options for each input”.
Please disable this above option and select other one called “Always show all values for inputs” -- screenshot attached.
After that you need to apply “active” css class on the filter manually. If you can do that at your own please go ahead and let me know, I am also trying this at my end and once ready I will send you the css code to use.