I'm looking into adding some custom CSS code to personalize a bit my dashboard. Say that I have a custom dashboard, I want the panels to have rounded corners. I have tested this code w/ the Firefox inspector (see below) and it works great though I don't know how or where to add it to make it permanent on my dashboard.
border-radius: 20px !important;
box-shadow: 0px 3px 1px -2px rgba(0,0,0,0.2),0px 2px 2px 0px rgba(0,0,0,0.14),0px 1px 5px 0px rgba(0,0,0,0.12) !important;
Any guidance you could provide?