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User Activity

HI Team,I am trying to modify the "Technology services"  dropdown items text color to white, any one suggest where i can  navigate for this change 
i Just want to modify the My Favorites and My active items widgets in ESC portal as per my requirement, where do i navigate for this modifications
Iam trying to add excel file(attachment section) in catalog item after submit the request user's manager or system administrator need to approve and then only attached excel file data should store in service now user created table.
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