table {
  width: calc(100% - 40px);
  margin: 20px;
  border-collapse: collapse;
}
td {
  border: solid 1px #aaa;
  padding: 8px;
  font-size: 12px;
}

tr:nth-child(odd) {
  background-color: #eee;
}

th {
  background-color: #ccc;
  border: solid 1px #666;
  min-width: 60px;
  font-size: 12px;
}