Show Table Border

On what website?

Modify your CSS:

table tbody tr td {
    text-align: center;
    border-width: 1px;
    border-style: solid;
    border-color: #CCC;
    padding: 5px;
}

And remove this:

#maincontentcenter table tbody tr td:first-child {
    /* border-right: 1px solid #ccc; */
}

Aside: You’re theme is not mobile friendly. Rather than putting too much more energy into this, you might consider finding a new, responsive theme.