For the data zone rows, you could set css background color differently for odd and even children following this guide:

.krpmDataZoneDiv tbody:nth-child(odd) {
    background-color: white;
}
.krpmDataZoneDiv tbody:nth-child(even) {
    background-color: lightgray;
} 

For total rows and columns you could inspect element and use their css class to set font style = bold. For example:

.krpmDataCellRowTotal,
.krpmDataCellRowGrandTotal,
.krpmDataCellColumnTotal,
.krpmDataCellColumnGrandTotal {
    ...
}

Oh sorry, the background rules should be like this:

.krpmDataZoneDiv tbody tr:nth-child(odd) {
    background-color: white;
}
.krpmDataZoneDiv tbody tr:nth-child(even) {
    background-color: lightgray;
}