You can adjust the transparency of your background image within your form's Theme window.
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Open the Theme & Appearance menu in the question panel, and select UI Elements → Background.
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Below the box labeled "Background Image," locate the field "Overlay Color" under the section titled "Overlay."
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Click on the box provided, and a color picker window will appear.
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Near the bottom of the color picker, you'll see a rainbow bar and a checkered bar - the checkered bar controls the transparency of your image.
You can adjust the background transparency by dragging the slider bar left and right or manually entering a value between 0 and 100 in the field labeled "A" just below the transparency slider.

Image Overlay Blur
You can also add overlay blur to the image in the same theme section. Play around to achieve the desired look of your form's background!
This option is also located in the "Overlay" section of "Background."
Gotchas
- The Overlay section will not appear unless you have selected either a Background Video or Background Image.













