Error in parameters of function rgb() in portal-content-preview-info-tab.cssDescriptionError message caused by portal-content-preview-info-tab.css when refreshing ESC portalhttps://<instance>/nav_to.do?uri=sp_css.do?sys_id=12a60c13c3db10102e123a7ea940ddcdError in parameters of function rgb(), line 132, column 31: [Substitution error: some actual parameters were not used. Formal parameters: FormalArgumentList[$red: null, $green: null, $blue: null], actual parameters: Actual argument list [ArgumentList [0, 0, 0, .3]] at line 132, column 37]: no thrown errorSteps to Reproduce Open ESC portalopen the browser console, right-click on the "Refresh" button selecting "Empty cache and hard reload"Look at the platform log errors and the message is thrown:Error in parameters of function rgb(), line 132, column 31: [Substitution error: some actual parameters were not used. Formal parameters: FormalArgumentList[$red: null, $green: null, $blue: null], actual parameters: Actual argument list [ArgumentList [0, 0, 0, .3]] at line 132, column 37]: no thrown errorWorkaroundSearch for all CSS function "rgb(...)" and check the parameters count. If the parameters has a 4th value (0,0,0,0.5), replace 'rgb' with 'rgba'. .popover-title { font-size: 20px; border-bottom: 1px solid rgb(0,0,0,0.3); <=== change to rgba(0,0,0,0.3);}Related Problem: PRB1765423