*, html {
    margin: 0;
    padding: 0;
}
.container {
    position: relative;
    max-width: 1140px;
    margin: 0 auto;
    padding: 50px;
}
td {
    border-style: ridge;
    padding: 5px;
    width: 40px;
    height: 40px;
    text-align: center;
    vertical-align: middle;
 }
 tr:nth-child(2n + 1) {
    background-color: rgb(223, 227, 235);
 }