How can I make an 'Add to cart' button border always visible?

Hello, can someone please provide the code to have the border around “Add to cart” buttons always on.
Right now the border is only on when I “mouse over” the button.
My website is www.checkoutfirst.com
Please see sample.

@checkoutfirst

yes, please add this code

  1. Go to Online Store->Theme->Edit code
  2. Asset->/theme.scss.liquid->paste below code at the bottom of the file.
.btn--primary {
-webkit-box-shadow: 0 0 0 0.2rem #00e6b0;
    -moz-box-shadow: 0 0 0 .2rem #00e6b0;
    -ms-box-shadow: 0 0 0 .2rem #00e6b0;
    -o-box-shadow: 0 0 0 .2rem #00e6b0;
    box-shadow: 0 0 0 0.2rem #00e6b0;
}