th:first-child{background: red;}
th:first-child + th{background: cyan;}
th:first-child + th +th{background: goldenrod;}
th:first-child + th +th +th{background: aquamarine;}
th:first-child + th +th +th +th{background: sienna;}
th:first-child + th +th +th +th +th{background: yellow;}
th:first-child + th +th +th +th +th +th{background: darkblue;}
td:first-child{color: red;}
td:first-child + td +td +td +td +td +td{color: darkblue;}
td.r2{color:red;}