I have added water mark using \backgroundsetup
\backgroundsetup{
angle=45,
scale=1,contents={\includegraphics[allpages,
]{water_mark.png}}}
\usepackage[most]{tcolorbox}\tcbset{colback=blue!8!white,colframe=blue!25!white, boxrule=0pt, left=10pt,right=10pt,top=10pt,bottom=10pt, arc=0pt,outer arc=0pt}
\begin{tcolorbox}\begin{verbatim} texts in box\end{verbatim} \end{tcolorbox}
This what I have achieved:
I am happy to see the watermark in every page but the problem is that some pages have images and custom boxes, in such pages the watermark is below that images and boxes. I want the watermark above the image or box.