#tableFreeAtoms {
    border-collapse: collapse;
    margin-left: auto;
    margin-right: auto;
    margin-top: 10px;
    width: 65%;
}

    #tableFreeAtoms td {
        border-color: rgb(170, 170, 170);
        border-style: solid;
        border-width: 1px;
    }

#tableNSAtoms {
    border-collapse: collapse;
    margin-left: auto;
    margin-right: auto;
    margin-top: 10px;
    width: 65%;
}

    #tableNSAtoms td {
        border-color: rgb(170, 170, 170);
        border-style: solid;
        border-width: 1px;
    }