table.koushu_h21 {
    margin-left: 4em;
    margin-top: 1em;
    margin-bottom: 1em;
    font-size: 105%;
    border-collapse: collapse;
}

table.koushu_h21 tr td {
    border-top: 1px solid gray;
    border-bottom: 1px solid gray;
}


table.koushu_h21 tr td.c {
    border-left: 1px solid gray;
    border-right: 1px solid gray;
}