Use the CSS class projectdoc-alternating for a HTML table to get alternating colored table rows.
Tables generated by the projectdoc Toolbox set this selector to allow different styles on odd and even rows.
table.projectdoc-alternating tr:nth-child(odd) {
background: #FFF;
}
table.projectdoc-alternating tr:nth-child(even) {
background: WhiteSmoke;
}
The Display Table Macro can be configured to use this style.

Set the Render Mode to table=projectdoc-alternating
.
In case you need to use an alternate style, just type the name of your selector like this: table=my-table-style