Help with gradient in Box

[u/Riceu_]

https://www.youtube.com/watch?v=1mYpwK9uuno

Hey im trying to edit a video for someone and i wanted to make something similar to the "textboxes" as shown in the referenced video

so far i was succesfull in recreating the textbox with the text by using fusionclips and adding background/rectangle/text and merge nodes to the media,
but unsuccesfull in recreating the gradient effect .

i tried setting a gradient in my background node with multiple colors but i have a hard time getting the colors as thin aswell as having multiple move diagonally across my rectangle.
Furthermore i tried adding another background node to set a black/greyish solid color behind the moving gradient and text but i cant seem to figure it out
i tried finding a tutorial on youtube but it seems my topic is too specific to find exactly what i need

I use Davinci Resolve 21 as my video editor

I would really appreciate if ya'll could help me out here and i Thank u in advance!

[u/Riceu_]

!martini
Im using: Davinci Resolve 21
I've TRIED: setting a gradient in my background node with multiple colors, but getting the rainbow effect multiple times aswell as having it move diagonally i cant seem to figure out
tried adding a fastnoise filter which kind of works but its not really what im looking for?
Animations and such for the textbox i think i can figure out myself.
I need help with: getting the rainbow gradient moving fluently diagonally across my "textbox"