change the color arrangement of Gainsight within Salesforce

In salesforce lighting we are disabling expand or collapse button due to SFDC limitation.

So we have below ask from customer.

“Our Salesforce instance is branded for our company which makes the Gainsight search bar & Salesforce search bars almost identical in coloration. I think we could get around the expand/collapse button not working & being removed easier if we were able to make Gainsight more distinct within our Salesforce instance.”