Probably the reason for that is your custom CSS.
instead of inserting background images using custom CSS, please use the built-in options from the customizer.
Insert the image as a header background image through the
Customizing ▸ Header ▸ Styling…Header Background Image menu
also, insert the same image as a Body background image through the
Customizing ▸ General ▸ Body… Background menu.
after you inserted the image on these two places,
Insert the following code into Customizing->General ->Additional CSS:
background-color: rgba(255, 255, 255, 0);
This reply was modified 3 years, 4 months ago by Zex.