table{
    width: 40%; /*40% ekraani laiust*/
    height: 200px;
    border: 1pt solid yellow;
}
td{
    border: 1pt solid yellow;
    text-align: center; /*выравнивание текста*/
}
/*1.rida 1.lahter*/
#tabel1 tr:nth-child(1) td:nth-child(1){
    background-color: green;
}
/*1.rida 2.lahter*/
#tabel1 tr:nth-child(1) td:nth-child(2){
    background-color: blue;
}