table {
    margin: 20px auto;
}

.tbl-r02 th {
    background: #f0f0f0;
    border: solid 1px #f0f0f0;
    color: #666;
    padding: 10px;
}

.tbl-r02 td {
    border: solid 1px #f0f0f0;
    padding: 10px;
}

@media screen and (max-width: 640px) {
    .last td:last-child {
        border-bottom: solid 1px #f0f0f0;
        width: 100%;
    }

    .tbl-r02 {
        width: 80%;
    }

    .tbl-r02 th,
    .tbl-r02 td {
        border-bottom: none;
        display: block;
        width: 100%;
    }
}