After following the product documentation on how to create a custom SKIN for branding Identity Manager, the tabs at the top of the task are missing when using the custom SKIN url as shown below.
https://techdocs.broadcom.com/us/en/symantec-security-software/identity-security/identity-suite/14-4/virtual-appliance/administering-virtual-appliance.html#concept.dita_484b93c7f06198e8b27adcc2537229358eb17777_ModifyCAIdentityManagerBranding
All Identity Manager
When you follow the product documentation steps then the <SKIN_NAME>/ui7/ca/css/ca.css file has incorrect pathing so all of the eleven occurrences of ../../../../ui/ca-css/images need to be changed to ../../../../../../ui/ca-css/images in order for the image locations to load properly since the file is located two layers deeper in the path under /app/imcss/<SKIN_NAME>/ui7/ca/css/ca.css instead of /app/ui7/ca/css/ca.css is.
You need to edit your <SKIN_NAME>/ui7/ca/css/ca.css file and replace the instances of ../../../../ui/ca-css/images with ../../../../../../ui/ca-css/images instead.