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This Page Extension changes the breadcrumb background colour to a dark grey for example but more substantial CSS changes could be applied here which and can be applied to specific pages by entering the page you want it to run on or by using the forward slash to represent ALL pages
Configuration
Click on the on Setup tab
Click Page Extensions
Click the Add button
Enter the following information
Name: Change BreadCrumb Colour via CSS
Page: / (enter a forward slash to make the script apply to all AdminPortal pages)Code Block language js jQuery("#crumb").css('background-color', '#47515b');
Click Save