Color overlay

To fill any color above the background image select the container containing the image, go to the Widget Properties Panel/Background/Overlay color and choose the color and transparency!

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Background fill

To fill a background color to whole project page go to Properties Panel/Page/Appearance and type in a color into the Background input field

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To Add one color background to your widget go to Widget Properties Panel/Background

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To add image as a background go to Widget Properties Panel/Background and press the Add image button:

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or double-click on the Widget.