*{
    padding: 0px;
    margin: 0px;
    box-sizing: border-box;
}
table{
    width: 100vw;
}
table, th, td{
    border: 2px solid black;
    border-collapse: collapse;
}
tr{
    background-color: aqua;
}
th{
    background-color: greenyellow;
}  
/* td{
    background-color: green;
} */
table{
    background-color: blue;
}
tr:nth-child(even){
    background-color: yellow;
}
td:nth-child(even){
    background-color: green;
}
/* tr:nth-child(3){
    color: white;
    background-color: blue;
}  */
/* tr:first-child{
    background-color: aliceblue;
} */