Remove Border around variations

I have a red border around the variations for a t-shirt I am selling and would like to completely remove the border. I attempted to change the css from:
.optin_table table, tr, td, th, tbody, thead {
border: 2px solid red !important;
text-align: center !important;
}
to this:
.optin_table table, tr, td, th, tbody, thead {
border: none!important;
}

And that isn’t working…
You can find it here: https://maintainernation.com/product/maintainer-shirt/?GD_NONCE=190a638622

Thank You

https://www.ads-software.com/plugins/woocommerce/