body {
   font-family: Arial, sans-serif;
}
.viivat td {
    border: 1px solid #000;
    padding: 4px 8px;
}
table{
   border-collapse: collapse;
}
th {
  text-align: :left;
}
.raidat tr:nth-child(even) {
    background-color: aqua;
}
.raidat th, .raidat td {
    padding: 4px 8px;
}