* {
    margin: 0;
    padding: 0;
    font-size: 1em;
    font-family: calibri;
}

main {
    padding: 3em;
}

table {
    border-collapse: collapse;
    border-radius: 1em;
    overflow: hidden;
    margin-bottom: 20px;
}

caption {
    background-color: #4caf50;
    padding: 1em;
}

table tr:nth-child(even) {
    background-color: #f0f0f0;
}

table tr:nth-child(odd) {
    background-color: #ccc;
}

table tr:nth-child(1) {
   background-color: #4caf50;
}

table tr td:nth-child(1) {
   background-color: #4caf50;
}

table tr td.square {
    background-color: #e53935;
}

table tr td {
    font-size: 1em;
    padding: 1em 2em;
}

table tr td:hover {
    background-color: #fff000;
}