(editor) How can i make this background?

https://preview.redd.it/19al8divksye1.png?width=360&format=png&auto=webp&s=73310fc279662a6dba6c70bcb6037f83b3b82ed0

Completely new to somewhat advanced level editing, how do i make this background using shaders?

https://preview.redd.it/jr3kykyylsye1.png?width=390&format=png&auto=webp&s=d4ba1cc23168c88e67588270a63f98b0d380b125

I figured Shock Wave + this pattern would go well, but it's affect all screen and i only want a background! Help please!

https://preview.redd.it/7cdh2cgsmsye1.png?width=1847&format=png&auto=webp&s=0b1c2833f0e4b2033c76ffc0e0f798e0b1e50d37

Here is the result of playing with the shockwave shader. still not so good tbh