Table { border: 2px solid blue;
    border-spacing: 10px;
    border-style:dotted;

}
th,td {
    border: 1px solid black;
}
Table {
    width: 1000px
}

thead tr:nth-child(1) th:nth-child(1) {
    background-color: cyan;
    color: orange;
    height: 100px;
    width: 150px;
}
thead tr:nth-child(1) th:nth-child(2) {
    background-color: green;
    color: white;
    font-size: 25px;
    height: 75px;
} 
thead tr:nth-child(2) th:nth-child(even){
    background-color: green;
    color: white;
    width: 125px;
}
thead tr:nth-child(2) th:nth-child(odd) {
    background-color: blue;
    color: peachpuff;
    width: 125px;
}

