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The size of the background image would depend on the device that your users would most likely use. So if your users will use a mobile device, you can tailor the image for mobile devices, but if they use a desktop, you will need to use a larger image with high resolution.
You can check out this article which may give you a better idea of the best size for you: The Best Full Screen Background Image Sizes for Web Design
Please let us know if you need further assistance.
The design editor allows me to custom the page and form backgrounds with my image.
I am trying to design the page & form backgrounds to go with my theme (see green image below).
What pixel size / dimension / resolution should I design my backgrounds? Tks.
This would depend on the overall size of your form. If you would like your images to fit the background of your form perfectly without and stretching, I would recommend completing your form first. After the form is complete, you can see the exact dimensions and tailor your background image to fit.
can i check with you how i can adjust / custom the colors for the two areas highlighted in orange?
1. form page area
2. scroll bar area
am experimenting on the best fit theme...
To change the color of the form page area please insert the below CSS to your Custom CSS field:
Just change the color as you wish.
Regarding the scroll bar, it is the part of the Browser so as far as I know there is no direct CSS that applies. But I found this article that might be helpful.
If you have any additional questions please let us know.