Within Teamwork, you can upload your own custom CSS to customize how your Teamwork site looks.
CSS (custom style sheet) is used to define styles for your web pages, including the design, layout and variations in display for different devices and screen sizes.
Note: This feature is available on per-user Premium/Grow plans and above, as well as certain legacy plans.
Click your profile icon in the top right of your site and select Apps & Integrations from the dropdown menu.
Note: Only the site owner or site administrators can enable integrations.
In the Integrations section, scroll to the Custom Styles section and click Manage CSS.
A modal will open where you can select the Enable custom CSS for my account checkbox at the bottom of the modal. You can then paste your code into the text area.
Select Save Settings to apply your custom style sheet.
For more information, see: Changing the Color Theme for Your Site