The CSS for background color has been specified per row, and not for the entire table. You've also specific #FFFFFF, which hexidecimal for white.
To make the white background color apply to the entire table, specify it in the table-wide CSS, not per row:
Code:
.wp-table-reloaded-id-1,
.wp-table-reloaded-id-1 td,
.wp-table-reloaded-id-1 th {
border: none !important;
border-collapse: collapse !important;
border-spacing: 0px !important;
background-color: #ffffff !important;
.wp-table-reloaded-id-1 .row-1 td {
}
.wp-table-reloaded-id-1 .row-2 td {
}
.wp-table-reloaded-id-1 .row-3 td {
}