Change graphical properties of dashboard components as text, digital display

hi all, i'm writing a dashboard in node-red and I don't know how to customize color, form, style etc of many components as text label, digital display...there is a way to customize them?

Use the Developers Tools in your browser to find the right classe name, then change the style in a ui_template node.

thank you really really much...i'm new in dashboard world...can you suggest to me some tutorial?
many many thanks again

This one: Node-Red Dashboards -Beginners Guide