The above demonstrates the areas you are changing in the Flight Builder Theme page.  This example represents the "Boxed Width with Medium Logo" theme.  You are also choosing the colors of buttons and other decorative elements.

Create a custom theme for each Flight. 

1.  Choose a theme.  Select your landing page theme style.  Full Width is a bigger banner image and a smaller logo whereas Boxed Width is a smaller banner image and a bigger logo.

2.  Upload a banner image.  Hover over the area to add your image.  The image should be landscape of approximately 1920 x 1080 or 1280 x 720 pixels (16:9 aspect ratio).  The overall file size can not be larger than 2MB.  Generally, 72dpi is fine.

3.  Video banner.  If you'd prefer to show a video in place of a banner image, simply add the URL to a YouTube video in the field.  

4.  Logo.  Add your Organization's logo image.  This image is used on your flight's landing page and also on emails header.  The image size should be square or approximately 250 x 250 pixels.

5.  Color Theme. Choose a color palette for your Flight that coordinates with your theme. The Primary color is used on buttons, the secondary and tertiary colors are used on flags on some other decorative elements. Enter the Hex color code or click in the field to choose your color.

Important: Your images may be resized to fit the area. Image files may not exceed 2MB.