Gradient background

here is an online generator to make the css rules : Link
i don’t know what you mean by row – one easy way is to give it a custom class.
As a background-image definition it lays over the background-color

if you got the code f.e.:

.custom-class {
background-image: -ms-linear-gradient(top, rgb(30,87,153) 0%, rgb(125,185,232) 100%);
background-image: -moz-linear-gradient(top, rgb(30,87,153) 0%, rgb(125,185,232) 100%);
background-image: -o-linear-gradient(top, rgb(30,87,153) 0%, rgb(125,185,232) 100%);
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, rgb(30,87,153)), color-stop(100, rgb(125,185,232)));
background-image: -webkit-linear-gradient(top, rgb(30,87,153) 0%, rgb(125,185,232) 100%);
background-image: linear-gradient(to bottom, rgb(30,87,153) 0%, rgb(125,185,232) 100%);
}

see here: https://webers-testseite.de/background-gradient/