[SOLVED] TablePress tables and box shadow removal

I am not able to remove the box shadow from from my tablepress table.

Using tablepress and followed their guidance to remove the box shadow from my table. When I insert the code to the Tablepess Plugin Option, I get the message, "Options saved successfully, but “Custom CSS” was not saved to file." This is the code that TablePress provides:

.tablepress {
-webkit-box-shadow: none !important;
-moz-box-shadow: none !important;
box-shadow: none !important;
}

Is there something I have to disable in Atahualpa for this to work? If not Atahualpa related, please let me know and I'll look for my answer elsewhere.

I am using WP 3.6, Atahualpa 3.7.12, TablePress V1.1. Site is still on my computer only.

Thanks!