table.tcommon {
    margin-right: auto;
    border: 1px solid black;
    border-collapse: collapse;
}

table.tcommon td {
    border: 1px solid black;
    padding: 5px;
    text-align: left;
}

table.tcommon th {
    border: 1px solid black;
    padding: 5px;
    background-color: #c5c5c5;
}