twbs--bootstrap/assets/scss/_buttons.scss

// Buttons
//
// Custom buttons for the docs.

.btn-bd-purple {
  font-weight: 500;
  color: $bd-purple-bright;
  border-color: $bd-purple-bright;

  &:hover,
  &:active {
    color: #fff;
    background-color: $bd-purple-bright;
    border-color: $bd-purple-bright;
  }
}

.btn-bd-yellow {
  font-weight: 500;
  color: $bd-yellow;
  border-color: $bd-yellow;

  &:hover,
  &:active {
    color: $bd-graphite;
    background-color: $bd-yellow;
    border-color: $bd-yellow;
  }
}