Remove specific button border Custom CSS

Hi there, I have a button that I've added custom code to adjust the static color to, but the code I'm trying to remove the border isn't working. Here is the website www.ballardinn.com (it's the first button on the page) and here is the code I'm using:

#block-yui_3_17_2_1_1716160184041_16819 
{
    background: #f3f1ef !important;
border: none !important;
}

Try this instead:

#block-yui_3_17_2_1_1716160184041_16819 .sqs-button-element--primary {
  background: #f3f1ef !important;
  border-color: #f3f1ef !important;
}