Hi there,
You can use this site to generate the desired gradient:
https://cssgradient.io/
Then add this CSS:
.page-hero {
background-image: linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(9,9,121,0.46262254901960786) 35%, rgba(0,212,255,1) 100%), url(http://185.20.51.60/~hiremarqueeco/wp-content/uploads/2019/02/LED-uplighters-with-Festoon.jpg);
}
Just replace the linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(9,9,121,0.46262254901960786) 35%, rgba(0,212,255,1) 100%)
with the actual desired gradient generated from the link above.
Let me know if this helps ๐