Go to a project's detail > Templates and click the "Tweak design" button.
Personalize your emails by uploading the project's logo. We recommend you to upload a logo in SVG or PNG format. However, JPG or JPEG are supported too. The size limit is 400 kB.
In case, you don't have a logo for your project, the name specified in the template design will be used. It's also used as an alt text, that's useful, for example, when the recipient's inbox blocks images.
Pick a background and highlight colors which suit your brand.