table, td, th{
    border-collapse: collapse;

    border:solid black 3px;

}

th{
    border:solid black 3px;

    color:white;

    background-color: blue;
}

tr:nth-child(1n){
background-color: yellow;

}
tr:nth-child(2n){
background-color: green;
}


td:hover{
    color:blue;
    font-weight: bold;
    background-color: gray;
    }

    tr:hover{
        
        background-color: gray;
    }