for the odd rows - one approach you could take would be to add this to your theme.css
.anvil-data-row-panel:nth-child(even) {
background: %color:Gray 200%;;
}
this would make all even rows gray for all anvil-row-panels
more advanced…
If you only wanted anvil-row-panels
for some data grids gray - you could create an anvil role for the repeating panel
called striped
.anvil-role-striped .anvil-data-row-panel:nth-child(even) {
background: %color:Gray 200%;;
}