Trying to add buttons to image card block on Jaunt template

I'm trying to add buttons to an image card block using this code however it made zero change to the page. any tips? Using the Jaunt template (not live so no page to show).

I followed the instructions on this page Image Card Block With 2 Buttons — Ghost Plugins

// 2 Buttons Image Card //

.sqs-block-image .design-layout-card a {
  background: #000;
  color: #fff !important;
  padding: 15px 30px;
  border-radius: 0px;
  border: 1px solid #000;
  margin-top: 10px;
  display: inline-block;
}

Can you share link to page where you use Image Card Block?