table {
    border-collapse: collapse;
    text-align:center;
}

th {
    font-weight: bold;
    background-color: darkseagreen;
    border: 1px solid green;
}

td {
    border: 1px solid green; 
}

tr:nth-of-type(2n) {
    background-color: cornsilk;
}

tr:nth-of-type(2n+1) {
    background-color: aliceblue;
}