Table not Centering, even after adding CSS code

To center a table, I added the code supplied by TablePress:

.tablepress-id-3 {
width: auto;
margin: 0 auto 1em;
}

My table ID is: [table id=3 /]

I saved the settings and updated my post but the table is still not center-aligned. I also tried removing the “-id-3” part in order to apply the “center” setting to all tables but that didn’t work either.

So, how can I get my tables to align cenrer?

Here you can view the post mentioned above:
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Thank you!

https://wordpress.org/plugins/tablepress/