table {
    border: 1px solid black;
    border-radius:50px;
    width:60%;
    background-color:lightgreen;
    padding:10px;
}
th {
    border: 1px solid black;
    border-radius:10px;
    height:50px;
    width:70px;
}
td {
    border:1px solid black;
    border-radius:100%;
    text-align:center;
    background-color:white;
    border-color:red;
    color:blue;
    height:60px;
    width:60px;
}
td:hover {
    background-color:yellow;
}