In order to change your landing page with your branding elements like colours, fonts and logo follow the below instructions.
1. Go to Settings & Privacy area
2. Select the Themes tab
3. Select the Custom theme option to change the default branding of the profile page
Then you can define the Primary, Secondary and Accent colors using the color codes of your branding guidelines.
Also, you can upload your own a logo too
4. Save changes to update your landing page with the changes you've done
5. In order to view the updated profile select View My Profile option