.groupInOneColumn
 {
     /*border-style: double;*/
 }
.text-center
{
    /*border-style: double;*/
}
.lectures-table
{
    margin: auto;
    margin-top: 50px;
}
.lectures-table td, .lectures-table th
{
    padding: 7px;
    font-size: 1.1em;
}
.button-new-parent-lecture
{
    margin: auto;
}