>>> .el-table--enable-row-hover .el-table__body tr:hover>td{
background-color: #e7edfd !important;
}
也可以：
>>> .el-table__body tr:hover>td{
background-color: #e7edfd !important;
}
>>> .el-table__body tr.current-row>td{
background-color: #e7edfd !important;
}