Center button text

This page has a two-column block with a Generate Blocks button in each column. The buttons render correctly but the button text does not center, even though the text is configured to center. I would like to keep the GB buttons if I can get the text centered. If I can’t get the text centered I’ll just create some CSS buttons and use Custom HTML instead of the GB buttons.

Thanks for your help.

https://acousticsspecialty.com

Here is the left button CSS from the website. Curiously if display: inline-flex; is dectivated the text centers but the button loses other formatting.

.gb-text-b9239d82 {
  align-items: center;
  background-color: rgba(255,255,255,0.15);
  border-bottom-style: solid;
  border-bottom-width: 2px;
  border-left-style: solid;
  border-left-width: 2px;
  border-right-style: solid;
  border-right-width: 2px;
  border-top-style: solid;
  border-top-width: 2px;
  box-shadow: 3px 3px 3px 4px rgba(0,0,0,0.1);
  color: #ffffff;
  display: inline-flex;
  font-size: 20px;
  font-weight: 500;
  height: 42px;
  letter-spacing: 1px;
  line-height: 1.2em;
  position: relative;
  text-decoration: none;
  transform-origin: center,50%;
  width: 240px;
  border-radius: 20px;
  padding: 1rem 2rem;
}