Are there specs for the Marketing Banner size?
By default, the banner has a fixed height of 425px.
As a reference, we suggest identifying a screen resolution you're planning to use with your application mostly. If you take the screen width and use it as a minimum width of the marketing banner, it should look good on your homepage.
Just for example, the default banner frame has dimensions 1200x425 with a dynamic width to fill the frame. You can use these dimensions as a reference for the proportions of your banner.
I recommend to try and upload an image as a marketing banner first for the sake of testing to check how it looks before publishing it to production. Likewise, you can try to use any webpage as your marketing banner to test the functionality first-hand and maybe invite unexpected ideas of how this feature can be used.
More about Marketing Banner.
