Answer by Josh Burgess for p:ribbon overrides spinner's button background
You should try the following:.ui-spinner.ui.ribbon .ui-button { background: none!important;}OR if .ui-spinner is a container element:.ui-spinner .ui-ribbon .ui-button { background: none...
View Articlep:ribbon overrides spinner's button background
The new <p:ribbon> component in PrimeFaces 5.1 overrides the background attribute of spinner component buttons using the class .ui-ribbon.ui-button (ribbon.css), which makes the spinner look like...
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