This customization gives you the freedom to alter design changes on the tenant login page (Customer Portal).
To do so, click on the Admin icon on the left sidebar menu.
Then click on Customization tab and click on Design Changes
There are 2 categories: Login Page and Find Storage. Here you can edit color changes as required. Then click on Save & Preview.
Clicking on Save & Preview gives you a preview of the customer portal on a new tab.
Similarly, changes you make on (Find Storage) is affected on customer portal