Hi,
thanks for your question.
To merge those CSS selectors, you can write them as
.tablepress-id-4 .row-hover tr:hover td,
.tablepress-id-5 .row-hover tr:hover td,
.tablepress-id-6 .row-hover tr:hover td,
.tablepress-id-7 .row-hover tr:hover td,
.tablepress-id-8 .row-hover tr:hover td,
.tablepress-id-9 .row-hover tr:hover td,
.tablepress-id-10 .row-hover tr:hover td,
.tablepress-id-11 .row-hover tr:hover td {
background-color: #ffffff;
}
If however you want to change this for ALL TablePress tables at once, you can simply use
.tablepress .row-hover tr:hover td {
background-color: #ffffff;
}
And if you don’t actually want that hover effect (i.e. if your default table color is already white), just uncheck the “Row Highlighting” checkbox on each table’s “Edit” screen.
For your other question: Merging cells is possible with “colspan” and “rowspan” buttons below each table’s input fields. You could also hide indivdual borders with some CSS like
#content .tablepress-id-4 .row-5 .column-3 {
border-right: none;
}
Regards,
Tobias