Columns: colors, center, manage

Hi
First, I’m impressed with your work and support. I can’t get the columns of a simple table to center, and have each column a different color.
On the test page, what I want are 3 columns/boxes to showcase fees.
The table on the page is not centered or clearly differentiated.

Here’s the code I tried (and I’m NOT a tech person so this is hard for me.)
.tablepress thead th,
.tablepress tfoot th {
background-color: #82f29e;
text-align: center;
}

.tablepress thead td {
font-family: Tahoma;
font-size: 16px strong;
background-color: #ffffff;
}

.tp_table id=2 / .column-1 th {
background-color: #b8f2d2;
text-align: center;
font-size: 14px;
width: auto;
}

.tp_table id=2 / .column-2 th {
background-color: #b7d5f1;
text-align: center;
font-size: 14px;
width: auto;
}

.tp_table id=2 / .column-3 th {
background-color: #b8f2d2;
text-align: center;
font-size: 14px;
width: auto;
}

I can’t tell you how much I appreciate your help!

The page I need help with: [log in to see the link]