table:nth-of-type(odd) thead tr th:nth-of-type(1) {
  width: 25%;
}
table:nth-of-type(odd) thead tr th:nth-of-type(2) {
	width:75%;
}

table:nth-of-type(even) thead tr th:nth-of-type(1) {
  width: 50%;
}
table:nth-of-type(even) thead tr th:nth-of-type(2) {
	width:50%;
}