zoneminder/web/skins/classic/css/dark/views/frames.css

#contentTable.major .colId, #contentTable.major .colType, #contentTable.major .colTimeStamp, #contentTable.major .colTimeDelta, #contentTable.major .colScore {
    text-align: center;
}

tr.alarm {
  background-color: #fa8072;
}

tr.bulk {
  background-color: #000000;
}

tr.normal {
  background-color: #222222;
}